CMMG Pattern Dedicated 22 LR Reliability

[Clint]

Yes, there seems to be some general interference between the extractor and groove.

We had a dedicated barrel where the groove was clocked a bit wrong and the extractor would contact the side.

With that fixed, the bottom of the groove does seem to lift the extractor slightly.

The stock extractor also seems to be pretty soft.

Perhaps the BoreBuddy hardened extractor is an improvement.

I did slightly reshape the front of my extractor where it was contacting the grove in the barrel. This lets it sit all the way down on the rim.

[AndyLate]

Just an update - still shooting my 16" CMMG pattern dedicated rimfire AR with CMMG and Black Dog mags. It's still amazingly reliable and incredibly fun to shoot. I hit the range today with 2 of my sons and as usual some folks had to come check it out. It just runs and runs and my boys (ok, 30 something men) were hammering 50 yard steel plates as fast as they could squeeze the trigger.

I am guessing I am well over 10K rounds, the firing pin return spring breakage went away, and I am happier with it every time I shoot it!

Andy

[AndyLate]

I should have included this in my update. My third Bore Buddy weight also broke at the bridge. BB would have replaced it, but I just filed and polished the break and continue to use #3. Now I wish I kept my broken brass weight

I say my polished and plated "GI" trigger with reduced power hammer spring is "OK" because it has so much takeup/smooth creep that it almost feels like a short 2 stage trigger with a very light second stage. It is smooth and acceptably light though.

Andy