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Help: m1a gas system edition

749 Views 13 Replies 10 Participants Last post by  tailgunner
So, this might be the wrong place for this, but I thought I would reach out to the brotherhood.

I have a Springfield National Match m1a. The thing is a tack driver but wont cycle reliably.

I took it to a gunsmith who claimed that for some reason m1as can sometimes require higher grain rounds. He messed with it some, with some success.

So here is what I have noticed. If I shoot 7.62 or 308 in the 150s grain range it basically doesn't cycle. If I run 160s grain 308 it cycles maybe 50 percent of the time.

I am thinking of just running heavy 308 through it. So how high can you safely go with an m1a before you, say, mess up the op rod?

Any other thoughts on the issues I am having?
1 - 2 of 14 Posts
Does your rifle pass the tilt test?

If you turn the gas valve OFF, you can shoot the heavier loads without issue.
You really don't need an adjustable gas plug, all you need to do is turn off the gas valve when shooting heavy projectiles.

My M14s have a 1:10 twist rate, and group heavier projectiles tightly :?
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