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Thread: Feed Ramps

  1. #1
    Gunco Veteran hunter_02's Avatar
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    Apr 2012
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    Default Feed Ramps

    Gentlemen, what is the real-world difference between M-4 Style feed ramps and ol skool A2 feed ramps?

  2. #2
    AKAHOLIC o.d. ak's Avatar
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    Jul 2006
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    Probably not to be honest. As far as I am aware the M4 feed ramps were introduced as part of a reliability package to address issues of firing full auto with the fast cyclic rate/high bolt velocity of the short carbine gas system combined with the longer/pointier bullet in the M855 round.

    I have heard of some issues when mixing and matching M4 barrel extensions with standard A3 uppers due to a slight ridge that can be problematic on the transition from the upper to the barrel extension but I have no experience and that may all be hearsay.


  3. #3
    Gunco Addicted for life j427x's Avatar
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    the M4 got its name from the m-4 feed ramp. thats why the m4 is the m4, not the m16a6 or m177a4 or some such -- it got a new name so it could be sold to the DOD as a new weapon system.

    it was a insider deal to get more money from uncle sugar as best as i can tell.

    the m4s bullet guides ramps are cut deeper and longer than an a1-a2-- supposedly for heavy long bullets.

    i can't see that they help much because the bullets got to be nose diving really bad to even get on that part of the ramp-- good mags fix the problem. and a run a lot of long heavy bullets in 20"s without the m4 ramps.

    the m4 ramp might be helpful on a 6.8,6.5,7.62x39 or 300BO because the bullet is bigger and may get a little more contact with the ramps.

    the m4 ramps don't hurt anything --but it is very hard to tell IF they help at all-- but colt got a LOT more $$$ out of um.

    it is OK to run a m4 barrel in a a2/a3 upper , running a a2/a3 ramped barrel in a m4 upper can cause an issue cause it leaves a bump in the ramp.

    generally i don't concern myself with the m4/a2 ramps less it is the m4 upper with the a2/a3 ramped barrel. other wise it is mix and match time.
    Ftwash likes this.

  4. #4
    GuncoHolic Sprat's Avatar
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    Feb 2005
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    seems to be all the rage these days
    Sprat and sprat1 are one and the same.

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