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Well, took it to the range again today without doing anything to it. Fired about 100 rounds without a single issue... I think mineralman55 was right, just needed a little breaking in.

And no, I haven't tried a standard buffe and spring yet. That'll be next.

Thanks for all the input guys. I had a feeling that CMMG parts weren't the best way to go. I'm going to replace my bolt catch and spring with an Armalite. We'll see how that goes. As far as the trigger, it's a Geissele SD-E.

Here's a picture of her. Looking good. Just not running so good.

Hey Gents, New to this forum. I just recently finished my first build and I'm having an issue with the bolt not locking back after the last round is fired. Looking for some advise. Components list is as follows: Mega Maten Upper/Lower Billet set JP Supermatch 20" barrel, rifle length gas system JP adjustable gas block JP silent capture spring in A2 Reciever extension JP LMOS Bolt carrier CMMG MK3 Lower Parts Kit Magpul SR25 Pmags The rifle cycles fine other than a couple double feeds when under gassed. The bolt locks back just fine manually with an empty mag installed. Tried adjusting the gas block all the way open. Still not locking. Tried using Mil Surp 7.62, ZQ1 7.62, and .308 hand loads. Also tried 3 different mags. I noticed that the spring tension on my bolt catch is a little more than any of my other rifles. Could that be the issue? Any input would be greatly appreciated.