SG22 CMMG 22lr Dedicated Bolt Collar Adapter for .375 ID Liner
thingiverse
I was using a printed collar adapter made by hdawsome and then modified by myself but I found just one FTE caused it to melt when printed in PLA+ so I switched to a stainless steel dedicated collar. Bore Buddy sells one here https://borebuddy.com/product/22lr-barrel-collar/ as well as CMMG sells the official one. This printed part here will fit over the exposed .375 ID liner and fit inside of the stainless steel collar to stop the CMMG bolt from wiggling around. Added a receiver shim I made to fill in the gap between the upper and lower behind the bolt so everything lines up perfectly.
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