I just got a CMMG bolt, Right to Bear (made by CMMG) 9" 22lr barrel, and a couple CMMG mags from RTB, to make a dedicated 22 upper. I'll put it on an inexpensive standard stripped upper I've got laying around. After doing some research I came to the conclusion that running 22 lr through a 5.56 barrel with a 1/7-9 twist barrel was not the route I wanted to take because of accuracy concerns. I think the bolt only conversions are good for high volume practice where accuracy isn't a major concern. I'm hoping to do some small game hunting/pest control with mine, if it proves to be capable. I'll report back with performance once I get a handguard and barrel nut.
Check out Right to Bear for components. Botach had some deals and conversion bolts and mags too
