and add them to non-m4 barrels.? 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. By rejecting non-essential cookies, Reddit may still use certain cookies to ensure the proper functionality of our platform. So I'm thinking I ought to have M4 ramps in the gun because based on what I've read: Rifle receiver+M4 barrel = "OK" but not ideal. I bought a .458 upper to go with it, with the extra internal clearance cut before anodizing. So, lets glide down these lines below to erase your misconceptions about them. 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). 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. Not all mil-spec features advertised on the product information are the real mil-specs. 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! An upper without feed ramps can be used with a barrel that has them as the majority of the ramp is on the barrel extension. That puts the cartridge in a position where the extended feed ramp improves the breech-loading design. Lol. The ramp angles are different and changing the profile of the extension doesn't make it something it isn't. The only other time it seems to help is if the mag is feeding the rounds with the bullet slightly angled lower than normal. Reddit and its partners use cookies and similar technologies to provide you with a better experience. I recommend putting any AR-platform firearm together with a matched M4 barrel extension and upper receiver set, just because you can. Absolutely nothing to do with casing diameter, or whatever other weird sht you guys imagine. 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. Installing a Luth-AR Rifle Buffer Tube and an A2 Stock #1041. I just need a little guidance on this and I'm having trouble getting good results from Google. Costs about $40-50 to have the feed ramps reprofiled from what I can gather. Man, its crazy how many of yall have absolutely no idea why you do what you do. So, what is the difference between M4 feed ramps and regular ones? An older-version (or A2-style) feed ramp is cut only on the barrel extension itself (top). These Mil-Spec M4 feed ramps are part of the original CNC manufacturing process. Press question mark to learn the rest of the keyboard shortcuts. There is no way to make a carbine barrel extension out of a rifle barrel extension, period, full stop. Your discussions, feedback and comments are welcome here as long as they are relevant and insightful. On the other hand, I wouldn't consider them as a deal breaker, and they would not pass up a good deal with an upper only because it did not have them - the M4 feed ramps. You need to match up barrels to receivers for optimum performance. All NFA rules apply. A feed ramp is a basic feature of many breech loading cartridge firearm designs. Description. JavaScript is disabled. M4 16", SBN, 1:7, 5.56 NATO Barrel Specifications: - Caliber: 5.56 NATO (.223 REM) - Gas Tube: Car Add to Cart. Just put it in and shoot it. It has ran flawlessly (barring tuning of the gasblock when new) with several different brands of magazines and ammo. AR15.COM is the world's largest firearm community and is a gathering place for firearm enthusiasts of all types. 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. Either way is good and both types work great with semi auto only guns. Edited April 27, 2014 by Mark Gale The M4 was the first (allegedy) carbine length gas system. If you want precision, dont look to the mil-spec gun, look to the one that is popular in 3-gun competitions, at Thunder Ranch, etc. 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. 308 m5 using m4 feed ramps, which I belive are for the smaller round like. Issues can arise when receivers and barrel extensions are mismatched. Related: If you are using a Ar rifle, best green laser sight is good choice for hunting. Brevity matters. This can lead to a rare but odd situation; barrel and receiver mismatch. CARBON-15 Stripped Lower Receiver Any body need a anchor for a very small boat? Some barrels I see for sale say they include M4 feed ramps, and some uppers say they include them too. They are also 1/7 twist, 4150 steel, chrome lined, and button rifled like the real deal! One new winner* is announced every week! In general, all you need to understand is that the M4 feed ramps include the barrel extension and upper receiver. 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. Home Firearms Figuring Out Feed Ramps. Well, over the course of 5,000 rounds at .40 a round, you spent two grand on ammo. M4 extension with .350 M4 style feed ramps 11 Degree Target Crown Threaded Muzzle 5/8"x24 TPI Weight: 26.5 ounces When you purchase through links on our site, we may earn an affiliate commission, which supports our community. The ramps are in the barrel extension. This has been my concern with modifying the aluminum parts. A closer look at uppers and barrel extensions. i have an extra brand new M4 barrel extension ramp to replace a rifle ramp. Everything that you have on your side to make any weapons more reliable and work when it absolutely needs to is a plus. These units actually feature the NON-F-Marked (correct) front sight base. Experts advise on 31 degrees+30 minus-zip. Don't ever put non M4 ramped barrel on a M4 ramped upper receiver. BUT, I DO NOT TRUST MY LIFE TO THAT WEAPON. again, Thanks. I wouldn't be concerned at all with any wear after modifying an upper receiver. My experience with ARs is all A-1s. For use by barrel manufacturers. 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. 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. While this gun is a more of novelty build than a "serious use" AR, I intend to use good parts and want it to run as well as my other ARs. Upload or insert images from URL. The tip of the cartridge rarely comes into contact with the upper receiver. I suggest you get a rifle receiver. Try this little exercise: 1. If I have a rifle ramp upper and get the barrel later and coincidentally will have an m4 ramp. However, I have seen more than a few basement gunsmith hackjobs using a dremel, some Jack Daniels/liquid courage, and an unsteady hand that have made a total, unrepairable mess of the job. Caught a deal on a matched barrel and bolt. Bullets tend to bump, snag, and stub on these guns. 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. We have four combinations here: Thats receivers, bolts, and on down the list of the 100 or so parts that can make up an AR-15. This is a big tip, by the way, for pistol-caliber ARs. M4 Barrel Extension (M4 Feedramps) $22.95 (4 reviews) SKU: Barrel-Extension-M4 Stock Status: Quantity: Add to Wish List Description For your AR15, M16, M4. The only one I found is LaRue's upper, but it won't work with the hand guard I'm using (Geissele MKIII). 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. 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? I will attest that a rifle upper and a barrel with the M4 feedramps works just fine. Mil-spec is good for the masses, and if you want the job done it is a great start. Both. Mind shooting me a link where I can pick on a C marked A1 carry handle for $150? Read Now. The rifle receiver, doesn't have ramps on the receiver, they are only cut into the barrel. April 23, 2014 in Rifle - Technical. The parts are interchangeable. And that the M4s and M4A1s are issued M855 which has a slight difference in bullet shape vs. the older 55gr M193 BALL. The rifle-platform M16s dont use them. Inadequate knowledge about these feed ramps can lead to lots of problems with barrels because they are essential parts to guide the bullet up and into the chamber. [ARCHIVED THREAD] - M4 feed ramp barrel in a non M4 ramp upper. For someone who is new at trying to understand feed ramps it helps to read a couple different explanations. VerticalScope Inc., 111 Peter Street, Suite 600, Toronto, Ontario, M5V 2H1, Canada. A4 Complete Upper Receiver - 7075 Forged A4 Flat Top Upper Receiver - M4 Feed Ramps Includes: - Add to Cart. Id just get one for that barrel and find a barrel with m4 extension for the upper you already have. So the engineers lowered the feed rampa into the receiver. I've been thinking about doing sort of an "Early Diemaco C8 carbine" clone build with a C7 style upper receiver. It has 2 ramps cut into the receiver to help the rounds feed into the chamber. 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 . I recently built an AR9 (Glock Mags) that has been running flawlessly for about 3-400rds. I'd rather not spent the money to get it cut to the specific length I need, FSB installed, etc just to have it immediately not work and have to sort out then or start from square one with a new barrel. I put together a second AR9 that is having a feeding issue, even if using similar parts as the first one. M4 Feed ramps on barrel extensions are a solid example. Ok, So, in short, I've got a barrel on my Armalite upper (with M4 feed ramps in the upper) that has standard AR-15 (non-M4) ramps. The Fora platform includes forum software by XenForo. Interesting reading. A4 Complete Upper Receiver. By accepting all cookies, you agree to our use of cookies to deliver and maintain our services and site, improve the quality of Reddit, personalize Reddit content and advertising, and measure the effectiveness of advertising. I have a non ramped barrel in a ramped upper, feeds fine. All Rights Reserved. Barrel customizations are also available. However the DD 14.5 are ideally meant to mate up with M4 style upper receiver feedramps. The extension is the part at the end of the barrel that fits inside the upper. They were not intended to be super long range man killers. Either way is good and both types work great with semi auto only guns. Amazing what happens in a thread over a simple question. pictures would help. Earlfillmore 13 hr. 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. Press question mark to learn the rest of the keyboard shortcuts. The M4 ramps, if I am not mistaken, were originally made to help reduce malfunctions on the M4 carbine. Modern Series Barrels. The M-16/M4 are great weapons. Your email address will not be published. You absolutely do not want it the other way around however. Which Model Colt 1911 is For Me? Higher pressure equte to parts (bcg, buffer, buffer spring, ROUNDS, etc) experiencing much higher wear/tear. It's not worth changing the barrel extension on an already finished barrel, getting the new barrel extension to line up correctly with the gas port will probably cost more in gunsmithing/machining fees than buying a new barrel. AR15.Com reserves the right to overwrite or replace any affiliate, commercial, or monetizable links, posted by users, with our own. True, which is why they're not even needed in semi autos. If you have a bolt that you would like to use you are welcome to ship it to us for accurate headspace. 4. FN AR15 barrels are hammer forged using the same proprietary high-grade Chrome Moly Vanadium steel used in FN's venerable machinegun barrels produced to handle the punishment of . Press J to jump to the feed. By $101.95. I have seen it done many, MANY times and if done right, it works/functions 100% without issue. Check often for fit. M4 feed ramps will extend the barrel extension and the upper receiver. We want you, our readers, to be able to make informed decisions. Jams and misfires. And it appears that the bolt is slamming into the top of the bullet. Description Genuine 14.5" SOCOM, carbine length gas system barrel from Colt. FFL Fax: 866-721-8691. I've seen that pic, it is a good reference. Should not be too hard. Sorta. However, its rare now to find an upper receiver or a ready-to-go barrel that doesnt have the M4 cuts. 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? Factory said its fine . M4 ramps help in feeding in for carbine in full auto. 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. this is the barrel designed and profiled for the Mark 12 Mod 0 uppers and rifles. In case My barrel is rifle ramp it won't be so bad after all. Editors Note: This article was originally published in January of 2019. Anything else you want to share about M4 clones would be appreciated, especially when it comes to a reliable rifle.
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