• New Contest Starting Now! This Target Haunts Me

    Tell us about the one that got away, the flier that ruined your group, the zero that drifted, the shot you still see when you close your eyes. Winner will receive a free scope!

    Join contest

WTB/WTT AR-15 .22LR conversion kit

I have 5000+ rounds through my CMMG. As mentioned prior they are excellent runners as long as you don’t lube them to much they run and run. That is a great deal at Brownells I paid pushing $200 for mine with only one mag.
 
in my experience...cmmg replaced the chamber withing the next couple weeks. Just keep it oiled and shoot whatever 22 you want as long as it doesnt have that wax on the bullets.