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I am having a tough time finding an in-stock barrel (18 or 20 incher) with a rifle extension on it. 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. Contents: 1 Diamond Burr (For Colt 2 Stage Ramps) 1 Cut Lube (For Diamond Burr) 1 Bullet Stone (For Reshaping . pictures would help. 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. 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). Create Account; Log Out ; Log In ; Wishlist 0; Shopping Cart 0; Home; About This gave it a longer point for the magazine to allow the rounds to come out of the magazine and feed into the chamber. 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? 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. document.getElementById( "ak_js_1" ).setAttribute( "value", ( new Date() ).getTime() ); Owning Best Ruger SR9c Accessories Can Change Your Life. 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. The parts are interchangeable. I didn't forsee that we'd ever see the day when replacement parts would be so hard to get. hey bro nice to see you here!!! You must log in or register to reply here. I have a 723 build (w/ C7 upper) and a 727 build (A2 upper) that use 14.5" Colt M4 barrels. upper recievers and barrels are hard to comeby. 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? When you need to nail something you use a hammer not a wrench. It gives a longer ramp that is less steep into the chamber. Remember less is more, little by little. The Bullet ~ Handguns, Rifles and Shotguns, http://thearguys.com/ar-facts/m4-feed-ramps/. I notice that's a Gibbz (or Gibbz-type) upper. 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. If you don't clean it but demand 3/4MOA you might get 1,500. Feedramps, proper staking of castle nuts, forward assist (yep went there)S-happens seen it. 2. To measure just where the round makes impact on the feed ramps, I did not use any sort of micrometer to measure. All things being equal and having used both weapons extensively, Id rather have the feed Ramps. Amazing what happens in a thread over a simple question. Press question mark to learn the rest of the keyboard shortcuts. This space is for pictures of "retro" Stoner rifles and completed or partial retro AR-15 builds, as well as discussions about either. Site towers are not "F" marked SPECS: Length- 14.5". The best case is to have both an upper and barrel that have the feed ramps. Use this M4 Barrel extention with M4 feedramps. Modern Series Barrels. Instead, I just loaded up each mag with two rounds, and pushed the rounds forward by hand until the tip of . Feed ramps on barrel extensions are a good example. M4 16", SBN, 1:7, 5.56 NATO Barrel Specifications: - Caliber: 5.56 NATO (.223 REM) - Gas Tube: Car Add to Cart. Change the angle so that the ramp ends at the exact same point. /r/ar15 is here for your favorite black gun links, build pics, questions and other tactical or practical information. Does it make a big difference? practical_man A4 Complete Upper Receiver. So I called. Little polish. AR15.Com reserves the right to overwrite or replace any affiliate, commercial, or monetizable links, posted by users, with our own. Is it worth the extra 50 bucks?" They aid in feeding the round into the chamber from the magazine more easily, which make uppers and barrel extension matched. The rifle-platform M16s dont use them. The Mission of Cheaper Than Dirt! So the engineers lowered the feed rampa into the receiver. I can still use the combination. 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. 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. 1 is a standard and the other for use with m4 feed ramp barrels. Higher pressure equte to parts (bcg, buffer, buffer spring, ROUNDS, etc) experiencing much higher wear/tear. Questions on how to install your new BA barrel? I cant advise on that one folks. All comments are held for moderation and will appear after approval. I've been thinking about doing sort of an "Early Diemaco C8 carbine" clone build with a C7 style upper receiver. The only other time it seems to help is if the mag is feeding the rounds with the bullet slightly angled lower than normal. 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). So, what is the difference between M4 feed ramps and regular ones? 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. which is basicallly an m16a1 cut down. The difference between standard feed ramps and M4 ramps is easy to see. I'm lookin for a clear definition as to what they are, and what they do to enhance a given rifle's performance? 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. 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 Check often for fit. It's best to have M4 ramps on both the upper and barrel. And that the M4s and M4A1s are issued M855 which has a slight difference in bullet shape vs. the older 55gr M193 BALL. Full M4 feed ramps start on the upper and continue onto the barrel extension. M4 Feed ramps on barrel extensions are a solid example. Backing up a ton: Any and all AR-15 barrel extensions have feed ramps. For this test, I used a Colt upper with M4 feed ramps and a SOCOM heavy 14.5 barrel, just like what is used in the military. Ideally both. 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. Its a miracle! No feed ramps. AR15.COM is the world's largest firearm community and is a gathering place for firearm enthusiasts of all types. Paste as plain text instead, 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). [ARCHIVED THREAD] - M4 feed ramp barrel in a non M4 ramp upper. The M4, and the CAR-15, before it have had similar problems like the ones you mentioned. I'm planning on replacing my forearm with a Larue 13.5. I don't have much to add re: feed ramps, but. There's a 7 degree difference between standard and M4 ramps. 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. 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. can the barrel extension be bought individualy? The information provided here does not represent the views of Cheaper Than Dirt! By Press J to jump to the feed. 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. Edited April 27, 2014 by Mark Gale However, they do have M4 feed-ramps which is not clone correct. However Ive built numerous ar15 and lr308 rifles and pistols. 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. Also, barrel life is relative. Given that most of us dont always have perfect access to truly genuine Mil-Spec, mil-standard parts (those actually used in issued fighting tools), were shopping based on a little part trust and a bigger part knowledge. 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 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. Notify me of follow-up comments by email. Our 6mm ARC barrel come standard with 1-7.5 Twist, M4 Feed Ramps and gas tube. And that is the important thing! Its easier to add feed ramps to the receiver not so easy to add them to the barrel extension. Lol. 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. Insert the barrel and sharpie the cut area, then use the right bit on a dremel. 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. Please allow 5~10 days for assembly and testing before ship date. They are better! So I'm working on my first build, and I'm a little confused. Polishing the edges of the chamber mouth to remove the edges of that chamfer will. I was planning on using a Daniel Defense 14.5 pencil barrel, because like the C8 they are CHF, lightweight profile, and .750 at the FSB (And also because quality carbine pencil barrels with .625 gas blocks seem to be in short supplyor else I'd just build a 723 clone.) . Recommend using a gunsmith this route too if you are not comfortable. 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. No need to alter the upper. Does NOT include pin However the DD 14.5 are ideally meant to mate up with M4 style upper receiver feedramps. Try this little exercise: 1. Factory said its fine . 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. The upper is designed to have two levels of top rails for mounting of night vision in front of scopes. Damaged Ak front end Barrel in Trunnion with or without sight bases. what I fear the most is having an m4 ramp upper and then getting a barrel with a rifle ramp. Mil-spec is good for the masses, and if you want the job done it is a great start. In this episode of Gun Stock Reviews, we look at the difference between M4 Ramps and the old standard ramps of the past.