My original 1972 (Colt/Kaiser 603 upper with 1/12 SAK barrel ) shoots well with my spare CMMG SS 22 Conversion unit . I have not tried my USGI M261 22 Conversion unit and my 10 round inserts for it or in any of my centerfire AR platform weapons . But I will eventually get it out to the range as I have had some CLE (Compass Lake Engineering ) upgrades and spares for it .
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