Is this possible? I have a .22 version with a dedicated PSA .22 bolt. Wondering if I can do the same thing with a 9mm bolt instead of a MAC upper.

  • notsuspekt@forum.guncadindex.com
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    1 month ago

    I second this but with the addition that you should use CMMG’s RDB action and some kind of conversion mags. Keep your ar-15 lower and upper receiver, the only change is a bcg and a barrel and the mags.