First time 9mm AR builder

[FaxonNathan]

Got it all put together today and put another 100 rounds of winchester whitebox through without a hiccup. I'm hoping the extremely simple blow back operation and relatively loose tolerances lend to a very reliable weapon for years to come. Though I have done no bench testing yet, just sighting in the irons show about 2" group off hand at 25 yards which is well within my expectations.


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NIIIICEEE!

[nate89]

So curiosity got the better of me, and I grabbed an A5 buffer from the parts bin and with an A2 rifle length action spring I went to the range with the 9mm AR. This is being used in a standard carbine-length receiver extension. I tried a few individual rounds in a mag to check for the bolt locking back, and to inspect for any obvious damage to and components. I ended up putting about 100 rounds through it in this set-up (carbine RE, rifle action spring and A5H4 buffer) with no function issues. It actually felt a little smoother than with a solid steel extended buffer like KAK sells. I would think about trying the A5 set-up, especially if you already have the parts around.