The 22 conversion kit in an AR is kind of a perfect storm for poor accuracy.
You've got a slow ass lock time, big swinging hammer introducing excess monkey motion, a long jump to the lands, an oversize bore with the wrong twist for 22 rimfire, and much longer barrel time vs 5.56.
I think it's not a horrible thing to have, and use. But you have to keep your expectations realistic.
I can't speak for the CMMG's accuracy but I"ve owned 8 of the Ciener .22lr kits over the years and in 1 in 9" or 1 in 12" rrifling twists, all grouped 2" at 50 yds, which is twice as much accuracy as you need for snapshoonting practice and plenty of accuracy for taking small game.
I'd be lerry of using one with a 1 in 7" twist. Ask about those at AR-15.com and rimfire central. Normal 22lr twist rates are 1 in 16".
