This gave it a longer point for the magazine to allow the rounds to come out of the magazine and feed into the chamber. Full M4 feed ramps are on both the upper and barrel extension. "C" stamp and CAGE code available. Your discussions, feedback and comments are welcome here as long as they are relevant and insightful. I guess it depends on what your relationship to the necessary shop activities is. Standard vs M4 Feed Ramps, what's the difference #1056 The barrels also had to be modified. 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. Experts advise on 31 degrees+30 minus-zip. These Mil-Spec M4 feed ramps are part of the original CNC manufacturing process. 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. Notice how the ramp starts on the barrel extension and not in the receiver. Feed ramps being m4 or. Went back to the sellers website and found I was not the only one with problems. Remember less is more, little by little. That's an important thing since without the feed ramps, issues can arise when receivers and barrel extensions are mismatched. 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. Ideally both. I can assure you that most mods that deviate from the original design aren't 100% reliable. However, they do have M4 feed-ramps which is not clone correct. FFL Fax: 866-721-8691. I'd rather just pay the gunsmith to make it work than hunt down another barrel/upper if possible. Barrel FAQs | Ballistic Advantage Edited April 27, 2014 by Mark Gale Earlfillmore 13 hr. For instance I was looking at the BCM upper receiver, and it said it had M4 feed ramps machined into the upper. I'm lookin for a clear definition as to what they are, and what they do to enhance a given rifle's performance? 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. Powered by Invision Community, M4-style barrel extension with Rifle-type upper. 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.) . is the m4 feedramp common in barrel extensions?
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adding m4 feed ramps to barrel