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Brian Enos's Forums... Maku mozo!

Double feed problems Ar-15 40 caliber

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So this is a brand new build. I have a 40 cal ar-15 built on a spikes tactical glock lower. It has a 7 inch barrel with a linear compensater. It's gas blow back only. Im using and Ar-10 buffer spring and a 9 oz buffer.

I took it to the range and it would randomly double feed (about every 3 to 5 rounds) the bolt slammed pretty hard at one point pushing the bullet into the casing. Anyone have any ideas


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