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. Thats true overall and good to keep in mind. I think you will find that the tip of the bullet clears the M4 cuts in the upper receiver by a wide margin. Lol. I can still use the combination. and add them to non-m4 barrels.? In this episode of Gun Stock Reviews, we look at the difference between M4 Ramps and the old standard ramps of the past. Avoid Polishing Too Lightly Or Too Roughly Founded by Frank Galli in 2000, Snipers Hide has been offering informational videos, podcasts, and other support to its users in one location. Previous. Pasted as rich text. M4 extension with .350 M4 style feed ramps 11 Degree Target Crown Threaded Muzzle 5/8"x24 TPI Weight: 26.5 ounces With the bcg moving that much faster, the magazine springs were having a hard time supplying the rounds fast enough, AS WELL AS the tips of the rounds were digging into the feed ramps and catching. Here you can see an upper with "rifle" feedramps. The closest brand new barrel you are likely to find is the Windham Weaponry 20 inch 1/7 twist chrome lined barrel. Regular feed ramps are cuts into the barrel extension only, which allows guiding the round into the chamber during loading, making them a fundamental feature of many breech-loading firearm designs. M4 feed ramps are not an original design, they were designed for the M4 In fact, the . AR15.COM is the world's largest firearm community and is a gathering place for firearm enthusiasts of all types. 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. While I've got everything apart, I'm thinking I just want to put an M4 barrel extension on. 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 . Backing up a ton: Any and all AR-15 barrel extensions have feed ramps. If your upper isn't showing signs of bullets rubbing on the aluminum under the barrel extension, you should be good with M4 ramps. 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). Experts advise on 31 degrees+30 minus-zip. So I called. How long your barrel "lasts" depends on what your accuracy threshold is before you decide it is too bad to keep using. 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. You have the option of barrel type, thread, fluting, finish type and to add a match bolt. I'll probably build a pistol out of this one. We want you, our readers, to be able to make informed decisions. Your email address will not be published. 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. Any use of this content without express written consent is prohibited. So, what is the difference between M4 feed ramps and regular ones? Does NOT include pin #2. April 23, 2014 in Rifle - Technical. 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. Ar-15 Manufacturers Should Be Avoided: Which Should You Buy? It gives a longer ramp that is less steep into the chamber. I use it for hunting dogs only. I've shot a good deal of rounds through 20" A2's and I realize they run but you are describing issues that the M4 feed ramps alleviate, that would probably be good to reduce on A2's as well. 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). Description Genuine 14.5" SOCOM, carbine length gas system barrel from Colt. May 17, 2008 in The Armorer. 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. 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. JavaScript is disabled. I think you will find that the tip of the bullet clears the M4 cuts in the upper receiver by a wide margin. Polishing the edges of the chamber mouth to remove the edges of that chamfer will. These Mil-Spec M4 feed ramps are part of the original CNC manufacturing process. AR15.Com reserves the right to overwrite or replace any affiliate, commercial, or monetizable links, posted by users, with our own. 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. One new winner* is announced every week! 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. There is no way to make a carbine barrel extension out of a rifle barrel extension, period, full stop. You wrote that much to make a point that should have taken about 100 words? Oh well, as I tell my lovely and understanding bride, guns are relatively free. it's the ammo and training that cost real money. Which Model Colt 1911 is For Me? Snipers Hide is a community of Snipers of all kinds, focusing on long range shooting, accuracy, and ballistics. Its easier to add feed ramps to the receiver not so easy to add them to the barrel extension. Most of barrel assemblies and upper receivers on the market now have a present of M4 feed ramps. I have a 723 build (w/ C7 upper) and a 727 build (A2 upper) that use 14.5" Colt M4 barrels. which is basicallly an m16a1 cut down. Its not a big deal but still an important thing to remember and understand. It's best to have M4 ramps on both the upper and barrel. 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. FN AR-15 5.56X45mm Nato . this is the barrel designed and profiled for the Mark 12 Mod 0 uppers and rifles. Having been in military supply, I know that what the mil-spec means: it gets the minimum job done for thousands (millions) of parts/systems. practical_man And it appears that the bolt is slamming into the top of the bullet. If it was some flat top + 16" FSB barrel id just swap upper/barrel, but this is a little more challenging to do that with. Looking to spend $180-250 (depending on condition, forge mark and if a rear sight is included or not.) Questions on how to install your new BA barrel? However Ive built numerous ar15 and lr308 rifles and pistols. Does it make a big difference? I've been thinking about doing sort of an "Early Diemaco C8 carbine" clone build with a C7 style upper receiver. Costs about $40-50 to have the feed ramps reprofiled from what I can gather. If you have an account, sign in now to post with your account. $101.95. Product Description Surplus Colt 14.5" SOCOM, carbine length gas system barrel from Colt. Check often for fit. Clear editor. We have four combinations here: However the DD 14.5 are ideally meant to mate up with M4 style upper receiver feedramps. which is bad combo. 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! I cant advise on that one folks. Full M4 feed ramps start on the upper and continue onto the barrel extension. can you buy feed ramps individually? Rifles, Uppers, Lowers, Barrels, and more, [ARCHIVED THREAD] - Rifle vs m4 feed ramps, http://i135.photobucket.com/albums/q125/PursuitSS/Postings%20photos/c0d26170b75c3e6f9ea65a7d0862247e.jpg. "A Bad Day At The Range Is Better Than A Great Day Working". Earlfillmore 13 hr. M4 feed ramps. Either way is good and both types work great with semi auto only guns. The M4 receiver feed ramps are cut at a steeper angle and, as a result, extend down into the receiver wall. It's best to use rifle/rifle combo or M4/M4. I read in Bravo company that there are 2 kinds of flat top upper. The M4 style feed ramps and barrel extension provide consistent feeding and the matte black Manganese Phosphate finish resists external corrosion and oxidation. Other selections are available for upper, bolt and carrier, charging handle, handguards, flash hiders, and gas blocks. 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. This includes M4 feed ramps, barrel nut, front sight tower and sight post, and -28 threads for a muzzle device. 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. 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. The good idea is that the round, presented at a lower plane, will contact other lower feed ramps and go right on in. I recently built an AR9 (Glock Mags) that has been running flawlessly for about 3-400rds. For a better experience, please enable JavaScript in your browser before proceeding. I can assure you that most mods that deviate from the original design aren't 100% reliable. Only took a few minutes. There is a picture of the various options, hopefully another poster can link them. When you need to nail something you use a hammer not a wrench. This has been my concern with modifying the aluminum parts. I suggest you get a rifle receiver. 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. As suggested, its best to match the upper and barrel extension no worries that way. We're a little past that point as I already own both the barrel and receiver, both of which cant easily be replaced or swapped for a decent price. Gun smith said , not head spaced properly. All NFA rules apply. Your previous content has been restored. I will check with compass lake. Please be respectful of others. 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 (theyre lowered). Brevity matters. Its also recommended you polish the ramps once youve achieved the appropriate angle. Get The Best Trigger Pull Gauges To Make Every Shot Count. If you don't clean it but demand 3/4MOA you might get 1,500. The Fora platform includes forum software by XenForo. They guide the bullet up and into the chamber. Sorta. I'm assuming that you only need the ramps from one or the other. Feed ramps being m4 or. The M4, and the CAR-15, before it have had similar problems like the ones you mentioned. The barrel Throat is the second most critical component after angles and should be polished with utmost care. instead of mil-spec. I wouldn't be concerned at all with any wear after modifying an upper receiver. It's best to use rifle/rifle combo or M4/M4. By Yamil Sued August 6, 2021. document.getElementById( "ak_js_1" ).setAttribute( "value", ( new Date() ).getTime() ); Owning Best Ruger SR9c Accessories Can Change Your Life. True, which is why they're not even needed in semi autos. Whether they materialize or not depends on the direction of the mismatch. Ideally both. [ARCHIVED THREAD] - M4 feed ramp barrel in a non M4 ramp upper. The rifle receiver, doesn't have ramps on the receiver, they are only cut into the barrel.
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