SG22 22lr liner collar .375 (3/8") ID
thingiverse
Update: 09/14: I don't personally use this anymore, switched to a stainless steel version for added durability and use this now https://www.thingiverse.com/thing:4971437 to hold the liner within it. Resized ID to fit larger 3/8" (.375") liner. Also tightened up the extractor cutout and made the feedramp overlap the ID to better feed into the 3/8" liner due to the increased thickness. This will replace the .223 dummy round on the CMMG conversion bolt kit. Print with the chamfered edges downward and the feed ramp upward. This should absolutely be printed 100% solid and I'd highly suggest a high temp high-wear material like polycarbonate.
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