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@princeton your top sbr is what I’m looking to do, just with my 16” upper. Other than the CMMG 22lr conversion, what else would I need to make it run right?
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@princeton has provided good advice. I see the Borebuddy 1913 adapter is sold out. The KNS with Flange adapter is the same thing, minus the QD hole.
To your list for optimum functioning, I would add either the .22 charging handle, or better yet, fill the opening of a standard one with silicon, a poly spacer (sold by Borebuddy), or whatever. This is to stop the possibility of an empty case bouncing up into it and jamming the action.
The other thing I would do is to invest in Borebuddy's standard stainless steel bolt weight. This adds some weight to the bolt, brining it up closer to where most semiauto .22s are. This slows down the cycle a bit, which eliminates bolt bounce. Look on YT for vids of CMMG style BCGs with weight, and without.
Finally, I've not experienced it, but firing pin breakage seems to be a thing with these, eventually. Borebuddy offers beefed up firing pins and extractors.