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Posted: 12/13/2013 8:17:47 AM EST
whats the reason these are used on a m4 and not a a1-a2 setup?
Link Posted: 12/13/2013 8:20:33 AM EST
Really only affects full-auto carbines as far as I know.

Link Posted: 12/13/2013 8:23:08 AM EST
[Last Edit: 12/13/2013 8:24:01 AM EST by semiautomatic]
Go to Google and search this: "site:ar15.com m4 feed ramps" You will find a lot of information.
Link Posted: 12/13/2013 8:23:20 AM EST
Shortening the gas tube creates a higher impulse on the bolt carrier, which increased the rate of fire by something like 15-20%.

The increased rate of fire saw higher carrier movement speeds, which had a tendency to misfeed every so often. They made a few cuts to the feed ramps, and it fixed it.


It sorta matters in a semi, since you still have the same carrier movement speeds. But it's an issue of one malfunction in like 2,000 rounds or something.
Link Posted: 12/13/2013 8:26:17 AM EST
[Last Edit: 12/13/2013 8:26:33 AM EST by Alien]
I thought it had a lot to do with using longer rounds like tracers?
Link Posted: 12/13/2013 8:27:49 AM EST
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Originally Posted By Alien:
I thought it had a lot to do with using longer rounds like tracers?
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No I believe that is where the 1/7 twist rate came from.
Link Posted: 12/13/2013 9:22:45 AM EST
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Originally Posted By SGL_Shooter:


No I believe that is where the 1/7 twist rate came from.
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Originally Posted By SGL_Shooter:
Originally Posted By Alien:
I thought it had a lot to do with using longer rounds like tracers?


No I believe that is where the 1/7 twist rate came from.

Maybe I was thinking of frangible ammo too.
Link Posted: 12/13/2013 9:23:39 AM EST
Discussion ForumsJump to Quoted PostQuote History
Originally Posted By TrojanMan:
Shortening the gas tube creates a higher impulse on the bolt carrier, which increased the rate of fire by something like 15-20%.

The increased rate of fire saw higher carrier movement speeds, which had a tendency to misfeed every so often. They made a few cuts to the feed ramps, and it fixed it.


It sorta matters in a semi, since you still have the same carrier movement speeds. But it's an issue of one malfunction in like 2,000 rounds or something.
View Quote

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