After two months of back and forth, cleaned up the feed ramps. For the purposes of this chapter, we'll call the new one the M4, and the old one the AR. EDIT: Okay, I understand now! Please be respectful of others. Both. The rifle-platform M16s dont use them. Moreover, telling someone that an extension can be modified, while not a lie, is nothing more than mental masturbation when your post contains a caveat for having the knowledge and proper tools. I bought a .458 upper to go with it, with the extra internal clearance cut before anodizing. SKU: BCM-URG-M4-16 Features: M4 Feed Ramp Barrel Extension Caliber: 5.56 NATO Barrel Length: 16in Barrel Style: Standard Handguard: None BCM M4 Handguards (Double Heat Shield) - Black + $15.00 PKMR (Polymer KeyMod Rail) Carbine Length - Black + $24.95 PKMR (Polymer KeyMod Rail) Carbine Length - Flat Dark Earth + $24.95 Stock Status: Out of stock Seems counter intuitive to recommend an M4 cut upper, especially if the barrel Im looking at has the rifle feed ramp (not M4 cut). This has been my concern with modifying the aluminum parts. If I can correct an issue before it's an issue that is preferred. No feed ramps. Semi autos run slower than full autos. By rejecting non-essential cookies, Reddit may still use certain cookies to ensure the proper functionality of our platform. 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. Create Account; Log Out ; Log In ; Wishlist 0; Shopping Cart 0; Home; About 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? It is removeable with a special wrench and a barrel clamp/vise. Full M4 feed ramps start on the upper and continue onto the barrel extension. Most work performed while-you-wait, evening and saturday appointments available. However, its rare now to find an upper receiver or a ready-to-go barrel that doesnt have the M4 cuts. and add them to non-m4 barrels.? #2. 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 . Feedramps, proper staking of castle nuts, forward assist (yep went there)S-happens seen it. It was in the last few issues of SAR. 3. 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. 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). Our 6mm ARC barrel come standard with 1-7.5 Twist, M4 Feed Ramps and gas tube. In military situations, it is advantageous for rifles to function with damaged, worn, or less than ideally serviceable magazines. It's best to have M4 ramps on both the upper and barrel. Barrel is medium SPR profiled barrel, threaded with a 1/2-28 thread for the AE brakes and collar. For someone who is new at trying to understand feed ramps it helps to read a couple different explanations. What's the difference? Man, its crazy how many of yall have absolutely no idea why you do what you do. Snipers Hide is a community of Snipers of all kinds, focusing on long range shooting, accuracy, and ballistics. The barrel Throat is the second most critical component after angles and should be polished with utmost care. However, they do have M4 feed-ramps which is not clone correct. Which Model Colt 1911 is For Me? In general, all you need to understand is that the M4 feed ramps include the barrel extension and upper receiver. 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. If your upper isn't showing signs of bullets rubbing on the aluminum under the barrel extension, you should be good with M4 ramps. Copyright 1996-2023 AR15.COM LLC. AAC and anybody else that has any reasonable expectation of quality and reliability use an M4 feed ramp. M4 feed ramps will extend the barrel extension and the upper receiver. Recommend using a gunsmith this route too if you are not comfortable. By Go slow and you'll be done in no time. /r/ar15 is here for your favorite black gun links, build pics, questions and other tactical or practical information. - 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. 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. If you have a bolt that you would like to use you are welcome to ship it to us for accurate headspace. Then you can get a regular rifle barrel for the upper with no ramps. They offer a lower, more extensive, and smoother entry for any round of ammo, whether its necessary or not. Reddit and its partners use cookies and similar technologies to provide you with a better experience. Some gun owners believe that the M4 ramps can help for some of the larger-diameter cartridges in use. I can still use the combination. You have a rifle barrel. M4 ramps help in feeding in for carbine in full auto. 2. The closest brand new barrel you are likely to find is the Windham Weaponry 20 inch 1/7 twist chrome lined barrel. Anything else you want to share about M4 clones would be appreciated, especially when it comes to a reliable rifle. 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 . 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. Rear side of a CZ-75B pistol barrel showing the (here dirty) feed ramp. The difference between standard feed ramps and M4 ramps is easy to see. So there's a lot more going on with rounds bouncing up and down in the mags etc. The information provided here does not represent the views of Cheaper Than Dirt! This includes M4 feed ramps, barrel nut, front sight tower and sight post, and -28 threads for a muzzle device. Description. For new construction barrels only. 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. As they are becoming more and more a standard, and certainly do not do any harm to us. The M4 cut extends down beyond the edge of the barrel extension (has a scalloped appearance), and a correspondingly deeper cut in an M4-spec upper receiver effectively extends the ramps downward (they're lowered). 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. Any body need a anchor for a very small boat? 4. I think you will find that the tip of the bullet clears the M4 cuts in the upper receiver by a wide margin. I think your mistaking that with adding ramps to the receiver. Only took a few minutes. Feed ramps being m4 or. M4 Feed ramps on barrel extensions are a solid example. AR15.COM is the world's largest firearm community and is a gathering place for firearm enthusiasts of all types. There's a 7 degree difference between standard and M4 ramps. Interesting reading. In short, if you have a Dremmel you can do it yourself. FFL Fax: 866-721-8691. so im thinking I might as well just get the unramp upper. Its a miracle! VerticalScope Inc., 111 Peter Street, Suite 600, Toronto, Ontario, M5V 2H1, Canada. - The Shooter's Log, 2012 SHOT Show Special Report: Del-Ton TRX Rifle and More! . Seems like it should work to me, but be a real challenge to keep clean and be damned ugly to boot. ago KrinkyDink2 9 hr. Rifles, Uppers, Lowers, Barrels, and more, [ARCHIVED THREAD] - Rifle vs m4 feed ramps, http://i135.photobucket.com/albums/q125/PursuitSS/Postings%20photos/c0d26170b75c3e6f9ea65a7d0862247e.jpg. I've modified barrel/receivers even before M4 cuts came out and done some receivers when the barrels had cuts. 30 cal. 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. Go back to writing school. The M-16/M4 are great weapons. Home Firearms Figuring Out Feed Ramps. . Sign up for the ARFCOM weekly newsletter and be entered to win a free ARFCOM membership. Whether they materialize or not depends on the direction of the mismatch. There is no way to make a carbine barrel extension out of a rifle barrel extension, period, full stop. M4 barrel to non M4 receiver is fine, but not the other way around. JavaScript is disabled. Guess what? A feed ramp is a basic feature of many breech loading cartridge firearm designs. Feeds flawlessly. Proper maintenance and lubrication. For a better experience, please enable JavaScript in your browser before proceeding. Thread: Adding M4 feedramps to A1/C7 upper. I can assure you that most mods that deviate from the original design aren't 100% reliable. Well, over the course of 5,000 rounds at .40 a round, you spent two grand on ammo. I have a 723 build (w/ C7 upper) and a 727 build (A2 upper) that use 14.5" Colt M4 barrels. 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. Theres a bit more to it than just polishing. A4 Complete Upper Receiver - 7075 Forged A4 Flat Top Upper Receiver - M4 Feed Ramps Includes: - Add to Cart. i have an extra brand new M4 barrel extension ramp to replace a rifle ramp. M4 16", SBN, 1:7, 5.56 NATO Barrel Specifications: - Caliber: 5.56 NATO (.223 REM) - Gas Tube: Car Add to Cart. 's blog. . 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 They aid in feeding the round into the chamber from the magazine more easily, which make uppers and barrel extension matched. 3. Insert the barrel and sharpie the cut area, then use the right bit on a dremel. I too built a .458 SOCOM carbine . One new winner* is announced every week! Product Details Douglas 18" Flat Dark Earth Cerakoted 416 stainless steel barrel with 1-7 twist and M4 feed ramps. Amazing what happens in a thread over a simple question. 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). 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. And it appears that the bolt is slamming into the top of the bullet. The M4 receiver feed ramps are cut at a steeper angle and, as a result, extend down into the receiver wall. We reserve the right to edit as appropriate, delete profane, harassing, abusive and spam comments or posts, and block repeat offenders. I use it for hunting dogs only. He had more to say and added some more engineer and gun designer speak too. I recently picked up a barrel that I thought had M4 feed ramps, but it doesn't line up with my M4 feed ramp upper. can the barrel extension be bought individualy? Seems M4 is all the rage these days. I have a non ramped barrel in a ramped upper, feeds fine. The rifle receiver, doesn't have ramps on the receiver, they are only cut into the barrel. I just need a little guidance on this and I'm having trouble getting good results from Google. To measure just where the round makes impact on the feed ramps, I did not use any sort of micrometer to measure. It has ran flawlessly (barring tuning of the gasblock when new) with several different brands of magazines and ammo. Create an account to follow your favorite communities and start taking part in conversations. Higher pressure equte to parts (bcg, buffer, buffer spring, ROUNDS, etc) experiencing much higher wear/tear. 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. But, as with anything else, this work can go too far. Mind shooting me a link where I can pick on a C marked A1 carry handle for $150? 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! 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. 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.
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