[ARCHIVED THREAD] - M4 feed ramp barrel in a non M4 ramp upper. Personally, I would sell the rifle upper and buy an M4 upper - the cost will be small and you will end up with a more satisfactory end product. So like ORD says it is entirely 100% possible and plenty of people do it, but I would rather not do any work to this perfect barrel. Add 3% to the total cost for credit card purchases. M4 barrel to non M4 receiver is fine, but not the other way around. April 23, 2014 in Rifle - Technical. Somwhere in the 1990s I believe, Colt designed the M4 feed ramps, where they took some of the material out of the upper receiver, cut two little ramps in it and then cut the ramps in the barrel extention a little further forward. Description Genuine 14.5" SOCOM, carbine length gas system barrel from Colt. Is it worth the extra 50 bucks?" Copyright 2016 - 2023 by AdventureFootstep.com. The first reason is that they are, indeed, better. All uppers are assembled cleaned and tested before shipping. So there's a lot more going on with rounds bouncing up and down in the mags etc. Press question mark to learn the rest of the keyboard shortcuts. Anodized red parts. Change the angle so that the ramp ends at the exact same point. Should not be too hard. which is bad combo. However the DD 14.5 are ideally meant to mate up with M4 style upper receiver feedramps. I don't have much to add re: feed ramps, but. Polishing the edges of the chamber mouth to remove the edges of that chamfer will. I read in Bravo company that there are 2 kinds of flat top upper. Metal cases ammunition such as Wolf through an M4 clone? 30 cal. I will check with compass lake. Those ramps line up with the barrel, which are cut deeper than on a rifle barrel. It has 2 ramps cut into the receiver to help the rounds feed into the chamber. I bought a .458 upper to go with it, with the extra internal clearance cut before anodizing. I've seen that pic, it is a good reference. Oh well, as I tell my lovely and understanding bride, guns are relatively free. it's the ammo and training that cost real money. AR9 - Help diagnosing feeding issue. ago KrinkyDink2 9 hr. First, the M4 barrel and non-M4 upper isnt likely to cause issues, but due to the relief cut on an M4-spec upper, there will be a gap that works like an edge that most definitely can snag the bullet and stub the round. All NFA rules apply. They are also 1/7 twist, 4150 steel, chrome lined, and button rifled like the real deal! You cannot paste images directly. So, what is the difference between M4 feed ramps and regular ones? The ramps are in the barrel extension. Hasn't misfed yet, through initial break in up through 1k rounds, and that's mag length ammo. First of Im not a gunsmith or firearms professional. The Fora platform includes forum software by XenForo. Questions on how to install your new BA barrel? Whether they materialize or not depends on the direction of the mismatch. The trust part is accepting claims of USGI-spec parts actually being done to not only blueprint dimensions, but also made from the correct materials treated to the same processes. can the barrel extension be bought individualy? I'm a machinist in the aerospace industry and lucky enough to have. Come join the discussion about racing, builds, pro mods, hot rods, events, turbos, nitrous, superchargers, and more! Bear Creek Arsenal Barrels - 6.5 Grendel Type 2 Barrel This Gorilla Machining AR-15 16" heavy Black Nitride 6.5 Grendel barrel has a Carbine length gas system with a 1:8 twist. When carrying out feed ramp polishing, it is crucial to prioritize the frame's angles, which is a critical part of the feed ramp. As suggested, its best to match the upper and barrel extension no worries that way. We have four combinations here: One new winner* is announced every week! /r/ar15 is here for your favorite black gun links, build pics, questions and other tactical or practical information. However, its rare now to find an upper receiver or a ready-to-go barrel that doesnt have the M4 cuts. Our 6.5 Grendel Black Nitride rifle barrels are made from the finest 4150 Chrome Moly Vanadium and precisely rifled for high accuracy at a great price. There are now thousands of upper receivers and ready-to-use barrels that have the cuts of M4 feed ramps. It's best to have M4 ramps on both the upper and barrel. All we do is dremmel it to match - we dont remove it and grind to any specific angle. With a larger diameter case body sitting down in the magazine, the tip of the bullet sits lower in relation to the chamber/bore centerline than with a .223-size round. I replaced the M4 feed ramp barrel with a monolithic feed ramp barrel and no more problems. . Copyright 1996-2023 AR15.COM LLC. JavaScript is disabled. Seems like it should work to me, but be a real challenge to keep clean and be damned ugly to boot. M4 Feed ramps on barrel extensions are a solid example. You can run M4 cut barrels with rifle receivers, but not the other way around as it will create at catch that can hang up the bullets. One new winner* is announced every week! So, lets glide down these lines below to erase your misconceptions about them. Thanks. Feels like a silly question now that it makes sense. So I'm working on my first build, and I'm a little confused. By rejecting non-essential cookies, Reddit may still use certain cookies to ensure the proper functionality of our platform. FFL Fax: 866-721-8691. Upload or insert images from URL. One of the AR15 engineers under Gene Stoner pretty much said that the M4 isn't a good platform, especially once the gas port erodes a bit. It may not display this or other websites correctly. Either way is good and both types work great with semi auto only guns. Sign up for the ARFCOM weekly newsletter and be entered to win a free ARFCOM membership. Clear editor. You have the option of barrel type, thread, fluting, finish type and to add a match bolt. Some suggest taking a grinder to the extension area. Both. We reserve the right to edit as appropriate, delete profane, harassing, abusive and spam comments or posts, and block repeat offenders. Your discussions, feedback and comments are welcome here as long as they are relevant and insightful. I'd get jams from bullets hitting the back of the upper so I took a small round file and made the M4 ramps in the upper. You wrote that much to make a point that should have taken about 100 words? Interesting reading. instead of mil-spec. These units actually feature the NON-F-Marked (correct) front sight base. If you aren't 110% comfortable with doing the job, and you do not have all the tools and equipment to do it properly, then have a smith do it for you. Forged 7075-T6 aluminum is harder than a bulls balls. My alternative plan is to do exactly as you describe. check out the. Does anyone have a follow up that confirms or denies my claim? Sign up for the ARFCOM weekly newsletter and be entered to win a free ARFCOM membership. A feed ramp is a basic feature of many breech loading cartridge firearm designs. You want them to match. Reddit and its partners use cookies and similar technologies to provide you with a better experience. Caught a deal on a matched barrel and bolt. Notify me of follow-up comments by email. That is what I tell people when they try to convince me that they need a stainless barrel instead of chrome-moly. Shorter length equates to much higher pressure in the upper receiver. You need to match up barrels to receivers for optimum performance. pm me at BOG or PG, or get in touch with my number 09177542777 if you're interested. well.. it's kinda hard to get stuff in this part of the world. I've thought about it myself, and I'd like to see test results if any exist, displaying what reliability effect M4 ramps have on other barrel lengths. In general, all you need to understand is that the M4 feed ramps include the barrel extension and upper receiver. My experience with ARs is all A-1s. Bullets tend to bump, snag, and stub on these guns. Again, youll find plenty of videos on spooling up hand grinders to remedy feed ramp and ejection port issues with these larger cartridges, but I strongly suggest going factory-done aftermarket. Try this little exercise: 1. Barrel Length: 16" Barrel Material: 4150V Chrome Moly Vanadium Steel Barrel Finish: Phosphate Barrel Profile: M4 Chamber: 5.56 NATO Twist Rate: 1 in 7" Extension: M4 Gas System: Carbine-Length Gas Block Type: Low Profile .750" Diameter Upper Receiver: Forged 7075 T6 Aluminum Receiver Style: M4 Flat top with feed ramps Receiver Finish: Hardcoat Anodized There is no way to make a carbine barrel extension out of a rifle barrel extension, period, full stop. Your previous content has been restored. You CAN modify a rifle/A2 barrel extension to an M4 style extension, but it isn't always the best way to go unless you just have to do it. If you have a bolt that you would like to use you are welcome to ship it to us for accurate headspace. Ar-15 Manufacturers Should Be Avoided: Which Should You Buy? I think your mistaking that with adding ramps to the receiver. But, as with anything else, this work can go too far. Is one better than the other? You absolutely do not want it the other way around however. I think you will find that the tip of the bullet clears the M4 cuts in the upper receiver by a wide margin. Backing up a ton: The ramps on regular barrel extension are cut just to the edges, while the M4 feed ramps have deeper cuts in the M4-spec upper receiver. It's near impossible to replace the carry handle upper I have these days, and finding a colt chrome lined 20" light weight barrel isn't a walk in the park either. I checked what I have now. You will receive an email every Friday morning featuring the latest chatter from the hottest topics, breaking news surrounding legislation, as well as exclusive deals only available to ARFCOM email subscribers. I too built a .458 SOCOM carbine . The manufacturer said they had sold hundreds of barrels with out problems reported. If you ever have an issue, then look at getting a correct barrel for the upper. True, which is why they're not even needed in semi autos. He had more to say and added some more engineer and gun designer speak too. However, an M4 barrel extension is dished more so the feed ramps could extend downward, and then an area within the upper is shaped to match. It's best to use rifle/rifle combo or M4/M4. Can someone recommend or point me in the right direction of a good quality upper receiver for an SPR build that does not have M4 feed ramp cuts in it? So, an M4 feed ramp includes the barrel extension and the upper. Buy AR 15 16" .350 Legend Nitride M4 Profile Barrel 1:16: GunBroker is the largest seller of AR15 Parts Gun Parts All: 974000728 . A shorter gas tube means reduced gas pressure, and we all know what happens when there isn't enough pressure to cycle the bolt carrier group properly. In most cases the ramps only help during full auto mode while cycling at a high rate. I have a 723 build (w/ C7 upper) and a 727 build (A2 upper) that use 14.5" Colt M4 barrels. AR Tech Tip - Checking M4 Ramps for overhang School of the American Rifle 84.8K subscribers Subscribe 2.9K 90K views 2 years ago AR Tech Tip - Checking M4 Ramps for overhang Show more Show more. Full M4 feed ramps are on both the upper and barrel extension. 1 is a standard and the other for use with m4 feed ramp barrels. M4 feed ramps will extend the barrel extension and the upper receiver. I would just make sure to order rifle upper with rifle barrel extension or M4 upper with M4 barrel extension. -The Barrel MUST be removed from the Upper Receiver in order to use this Kit.-Never cut or polish the aluminum M4 Feed Ramps in your upper receiver! Guess what? A couple of times I ended up with the OK set up from the picture above. This includes M4 feed ramps, barrel nut, front sight tower and sight post, and -28 threads for a muzzle device. Does NOT include pin Seems counter intuitive to recommend an M4 cut upper, especially if the barrel Im looking at has the rifle feed ramp (not M4 cut). The M4 ramps, if I am not mistaken, were originally made to help reduce malfunctions on the M4 carbine. Some barrels I see for sale say they include M4 feed ramps, and some uppers say they include them too. Load a magazine with two or three rounds, lock the bolt group back on your rifle or carbine and insert the magazine. Which Model Colt 1911 is For Me? It's going to a gunsmith to be shortened and rethreaded anyways, can they just grind/polish the feed ramps to match or is it more involved than that? The upper I want to rebarrel is modified for Service Rifle competition so it's not quite as cheap as buying another $89 upper from Aero. The M4 style feed ramps and barrel extension provide consistent feeding and the matte black Manganese Phosphate finish resists external corrosion and oxidation. so it is better to have an upper reciever that's designed for non-m4 feed ramps since you can put in standard barrels right? Instead, I just loaded up each mag with two rounds, and pushed the rounds forward by hand until the tip of . Description. I would only add the feed ramps to the receiver if I had feeding issues, which you should not have. By rejecting non-essential cookies, Reddit may still use certain cookies to ensure the proper functionality of our platform. It was in the last few issues of SAR. All Rights Reserved. Thanks for explaining the feed ramp topic in a couple of different ways. All things being equal and having used both weapons extensively, Id rather have the feed Ramps. Add M4 cuts to Barrel Ext $15.00 We can modify your rifle extension to match the M4 cuts in an upper receiver. Proper maintenance and lubrication. The leading cause that leads to the development of the M4 feed ramp is the gas pressure from the carbine gas system that is increasing along with a high cyclic rate. A closer look at uppers and barrel extensions. M4A1s run at 950 rounds per minute in full auto and even 950+ rounds per minute as the gas port erodes open bigger and bigger with wear and allows them to run even faster and much more violent. And that the M4s and M4A1s are issued M855 which has a slight difference in bullet shape vs. the older 55gr M193 BALL. Now, theres nothing wrong at all with a little polish on any and all feed ramps, which can not only be done fairly easily, it can be successfully done by most at home. We want you, our readers, to be able to make informed decisions. I found the article very informative. Remember less is more, little by little. Single Action and Double Action Which One Is Better For You? Home Firearms Figuring Out Feed Ramps. Can I use a barrel with M4 feed ramps with an upper that isnt M4 matched? When you need to nail something you use a hammer not a wrench. I picked up a side charging upper from Sundevil last year. It has ran flawlessly (barring tuning of the gasblock when new) with several different brands of magazines and ammo. Also, barrel life is relative. I had seen these pix years ago and dismissed the idea of mix and match. The M4 was the first (allegedy) carbine length gas system. UPPER RECEIVER: AR-15 Mil-Spec Machined out of 7075-T6 Forged Aluminum, M4 Feed Ramps, Cerakoted Magpul Flat Dark Earth (FDE) Color with Forward Assist and Ejection Port Cover Installed BARREL: 22 inch, 223 Wylde Caliber, 4150 CMV, 1:7 Twist, Heavy Bull Barrel Profile, Straight Fluted, Melonite/Nitride Finish - made for us by Tactical Kinetics HAND Mind shooting me a link where I can pick on a C marked A1 carry handle for $150? The Shooter's Log, is to provide informationnot opinionsto our customers and the shooting community. What is an m4 feed ramp? Machined from 4150 Chrome Moly Vanadium Steel and feature a QPQ corrosion resistant finish and QPQ coated M4 feed ramp extension. Ballistic Performance of Federal Punch .22 LR Ammunition with the Heritage Barkeep #1063. I'd get jams from bullets hitting the back of the upper so I took a small round file and made the M4 ramps in the upper. If I was concerned with precision, I would seek out parts from well-known gun makers and customizers Baer comes to mind, Hart barrels, etc etc. For instance I was looking at the BCM upper receiver, and it said it had M4 feed ramps machined into the upper. Another reason is that any commercial receiver and parts makers want to tool up to make upper receivers and barrel extensions, especially when shorter guns are becoming more popular. The upper is designed to have two levels of top rails for mounting of night vision in front of scopes. I will attest that a rifle upper and a barrel with the M4 feedramps works just fine. Thats receivers, bolts, and on down the list of the 100 or so parts that can make up an AR-15. Go back to writing school. So, I had purchased a 458 upper. Now move move the on deck cartridge forward to the 3/8 of inch position and again note the position of the tip of the bullet in relationship to the barrel extension. You have a rifle barrel. 3. Please be respectful of others. Any body need a anchor for a very small boat? To conclude, the M4 feed ramps bring a lot of improvements to the AR-platform firearms. The information provided here does not represent the views of Cheaper Than Dirt! document.getElementById( "ak_js_1" ).setAttribute( "value", ( new Date() ).getTime() ); Owning Best Ruger SR9c Accessories Can Change Your Life. Go slow and you'll be done in no time. Sorta. This includes M4 feed ramps, barrel nut, front sight tower and sight post, and -28 threads for a muzzle device. DSA has fat top, Mueller, non feed ramp uppers for $40. You can modify the upper, but bear in mind that the un-anodized aluminum surface will be very soft and prone to wear if your particular bullet hits it frequently. Im an old vet, now retired and looking to build some ARs as a hobby to keep me doing something that I will enjoy. Feeds flawlessly. M4 ramps help in feeding in for carbine in full auto. Was sort of worried about how it would run with an 11.5" barrel and mismatched ramps, but it sounds like it should be good to go either way. You will receive an email every Friday morning featuring the latest chatter from the hottest topics, breaking news surrounding legislation, as well as exclusive deals only available to ARFCOM email subscribers. Jams and misfires. This Kit is made to cut or polish the STEEL Feed Ramps on your Barrel Extension ONLY. - The Shooter's Log, 2012 SHOT Show Special Report: Daniel Defense DDM4 V5 in .300 Blackout and a Factory SBR - The Shooter's Log, 2012 SHOT Show Special Report: SOG Armory Predator Rifle - The Shooter's Log, Surefire's 100-Round MAG5-100: The Highest Capacity AR-15 Magazine - The Shooter's Log, Throwback Thursday: Taurus Judge Range Report, ATI Milsport SGA 410 All the Advantages of an AR in .410, Ruger SR1911 LW Commander The Lightweight .45 ACP, Rifle Hack: Sighting for 100 Yards at a Distance of 25 Yards, Throwback Thursday: All About Bullet Grain. They aid in feeding the round into the chamber from the magazine more easily, which make uppers and barrel extension matched. The reason I decided to write about this topic at all was because there are some mil-spec features advertised on aftermarket parts that arent even really mil-spec. Featuring hand lapped 1/8 twist rate button rifling and M4 feed ramps barrel extensions, the 410 stainless barrel gives the shooter the best balance of weight and accuracy. You also repeated yourself. Subscribe to our monthly Newsletter to receive firearm news, product discounts from your favorite Industry Partners, and more. By Yamil Sued August 6, 2021. They provide a lower, wider, and smoother entry for any round of ammo, whether its necessary or not. Little polish. There's no downside to having M4 feedramps on your carbine, but they are not as necessary without full auto and when using followers that will not tilt (or in a 20 AR15). Editors Note: This article was originally published in January of 2019. It gives a longer ramp that is less steep into the chamber. I'm planning on replacing my forearm with a Larue 13.5. 4. This USGI modification was done to both the barrel extension and the upper receiver, creating a longer and steeper feed ramp. I should have taken my own advice for once. Subscribe to our monthly Newsletter to receive firearm news, product discounts from your favorite Industry Partners, and more. Olympic Arms Upper receiver with rear sight assembly and forward assist and dust cover has M4 feed ramps $260 View attachment 1016575 View attachment 1016576 i have an extra brand new M4 barrel extension ramp to replace a rifle ramp. I'm a machinist in the aerospace industry and lucky enough to have unrestricted access to a really nice machine shop so the modification from rifle to M4 feed ramps is no sweat, I've done it once before a few years back with a .250" carbide cutter in the mill for a friend and it came out looking indistinguishable from a true M4 extension. In this episode of Gun Stock Reviews, we look at the difference between M4 Ramps and the old standard ramps of the past. Its fine to use an M4 Barrel with a non-N4 (rifle) upper but if you have the barrel already is much simpler to just buy a M-4 upper and just replace the upper the barrel is harder to build..I have even cut ramps on a rifle upper and it really wasent needed That is before I knew better.Then I guncoted the ramps before I found out about Aluminum Black treatment. *Must have a registered ARFCOM account to win. Feed ramps on barrel extensions are a good example. For use by barrel manufacturers. Powered by Invision Community, M4-style barrel extension with Rifle-type upper. There's a 7 degree difference between standard and M4 ramps. For someone who is new at trying to understand feed ramps it helps to read a couple different explanations. M16s and M16-A1s run at 750 rounds per minute in full auto. I like all my guns to be reliable. Not all mil-spec features advertised on the product information are the real mil-specs. Thanks! So, what youre saying is that an M16 upper (not M4 cut) will work with either barrel, but an M4 cut upper will only work with an M4 cut barrel. By my estimates, the tip of the bullet first hits the barrel extension about 1/3 of the way up the respective feed ramp on the barrel extension. When you purchase through links on our site, we may earn an affiliate commission, which supports our community. Shopping with us is absolutely safe - you never have to worry about credit card safety when shopping here Share your latest AR build or photos from the range with #RangeDayFriday for a chance to win a new firearm! Just put it in and shoot it. There is a picture of the various options, hopefully another poster can link them. If you have an account, sign in now to post with your account. The magazine lips cannot move, so with these larger diameter cartridges, the bullet tips down lower about the centerline of the bore (half of the diameter increase to be exact). I wouldn't be concerned at all with any wear after modifying an upper receiver. Your link has been automatically embedded. The photo shows the dents and the bolt lugs line up perfectly. The Mission of Cheaper Than Dirt! The last is using the best and right ammo for the job. America's Ultimate Shooting Sports Discounter, Click to share on Facebook (Opens in new window), Click to share on Twitter (Opens in new window), Click to share on Pinterest (Opens in new window). Display as a link instead, Full M4 feed ramps start on the upper and continue onto the barrel extension. Does it make a big difference? You need to match up barrels to receivers for optimum performance. I have a non ramped barrel in a ramped upper, feeds fine. Reach in through the ejection port and slide the on deck cartridge about 1/4 inch forward and observe the tip of the bullet in relationship to the barrel extension. For a better experience, please enable JavaScript in your browser before proceeding. There are now thousands of upper receivers and ready-to-use barrels that have the cuts of M4 feed ramps. A4 Complete Upper Receiver - 7075 Forged A4 Flat Top Upper Receiver - M4 Feed Ramps Includes: - Add to Cart. Don't forget read more information about it here! If your mag catch is at Spec height, you should not have a problem with an M4 cut barrel in a rifle receiver. I recommend putting any AR-platform firearm together with a matched M4 barrel extension and upper receiver set, just because you can. can you buy feed ramps individually? Rear side of a CZ-75B pistol barrel showing the (here dirty) feed ramp. Some argue that, factually, its a step to enable a smoother feeding. It is a tightly machined and polished piece of metal which guides a cartridge from the top of the magazine into the firing chamber of the barrel. For new construction barrels only. However, if youre wanting to rebarrel a non-M4-cut upper with an M4 feed-ramp equipped barrel, or going the other direction: you have a new upper thats been relieved to fit with the M4 ramps, and a non-M4-cut barrel extension, and that wont work! It's an interesting question. I didn't forsee that we'd ever see the day when replacement parts would be so hard to get. Looking for a black stripped A1 upper with non m4 feed ramps (just realized the upper I have wont work with my barrel). "A Bad Day At The Range Is Better Than A Great Day Working". Is it kosher to add M4 feed ramps to a standard upper to match an m4 ramped barrel? The rifle receiver, doesn't have ramps on the receiver, they are only cut into the barrel. I prefer them. Your email address will not be published. For those who have actually done it will a new barrel with the M4 feed ramp extension function properly with an old school rifle-type upper receiver? If your magazines are set up correctly, and the feed lip edges polished smooth, each round fed from the magazine will go directly into the chamber. I'm lookin for a clear definition as to what they are, and what they do to enhance a given rifle's performance? Contents: 1 Diamond Burr (For Colt 2 Stage Ramps) 1 Cut Lube (For Diamond Burr) 1 Bullet Stone (For Reshaping . By my estimates, the tip of the bullet first hits the barrel extension about 1/3 of the way up the respective feed ramp on the barrel extension. The barrel extension and the receiver both have to have the cuts. However, they do have M4 feed-ramps which is not clone correct. I have seen it done many, MANY times and if done right, it works/functions 100% without issue. CARBON-15 Stripped Lower Receiver To measure just where the round makes impact on the feed ramps, I did not use any sort of micrometer to measure. You are using an out of date browser. Damaged Ak front end Barrel in Trunnion with or without sight bases. My factory JP CTR-02 has the appearance of the bottom right picture in the post above, M4 barrel extension in a rifle receiver, and there is not a mark on the aluminum under the barrel extension. Absolutely nothing to do with casing diameter, or whatever other weird sht you guys imagine. The M4 Style Feed ramps And Barrel Extension Provide Consistent Feeding And The Matte Black Manganese Phosphate Finish resists External Corrosion And OxidationLength: 14.70"Model: AR-15Finish: Manganese PhosphateBarrel Type: Carbine LengthBarrel Features: Chrome-LinedManufacturer: FN Mfg Number: 20-100405Model: AR-15 . Share it in the comments section. I just need a little guidance on this and I'm having trouble getting good results from Google. All this basically means is that the ramps continue from the barrel extension down through the upper receiver tonthe magazine. Dec 17, 2020. By using the M4 feed ramps for your firearm, you could pick up an increased percentage of the rounds, and feeding reliability would be improved. The good idea is that the round, presented at a lower plane, will contact other lower feed ramps and go right on in. 50 bucks one way or the other on the barrel ain't squat! Konza Defender M-LOK 5.56 16" Rifle 1x7 FEATURES: 16" 4150 Nitride 1x7 5.56 Barrel T-Marked Upper with M4 Feed Ramps Steel Micro Gas Block, and Carbine Length Gas Tube 15" 7075 T6 Aluminum Free Float M-LOK Hand Guard A2 Muzzle Break BCG is an M16 Style Nitride QPQ Finish Charging Handle Mil-Spec 6 Position Mil-Spec Diameter Stock Only took a few minutes. Additionally, in this increasingly specialized world of AR-15 parts that we live in, there are proprietary feed ramp cuts used for some alternate cartridges, such as .458 SOCOM. After two months of back and forth, cleaned up the feed ramps. Full M4 feed ramps start on the upper and continue onto the barrel extension. I have done the same, protect the Barrel extension with a layer of electrical tape and carefully file or Dremel the ramps into the aluminum receiver. While I've got everything apart, I'm thinking I just want to put an M4 barrel extension on. $101.95. The best case is to have both an upper and barrel that have the feed ramps. This is why you can use a barrel with an extension with M4 feedramps with a receiver that does not have feedramps, but you cannot use a receiver with M4 feedramps with a barrel with an extension with rifle feedramps. Upper Receiver, A4, Flat Top, USGI, Numbered, AR-Stoner Upper Receiver Stripped AR-15 A3 Flat-Top Matte, Black River Tactical 16 Cold Hammer Forged Optimum Barrel Accuracy Evaluation.
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