CMMG RDB 9mm Adaptor for Colt Magazines in PCC

Adapter to allow Colt style 9mm ASC Magazines to be used in conjunction with CMMG's Radially Delayed Blowback (RDB) uppers.

Designed to snap into part of the mag catch cutout, as well as the the first witness hole for round counts (10rnds). Works with both 10 round and 32 round magazines. Can be challenging to remove, but certainly not irreversible.

Does not work reliably with 147 gr bullets, but seems to work fine for 115 and 124 grain rounds.

Does not have a LRBHO in current version.

Print instructions

Most testing done at 0.2 layer height, 0.4 nozzle size, sliced using Cura.

Printed vertically, includes a built-in support for the adapter's mag catch hole. Carefully cut hole open prior to use.

If upper edge of mag catch hole is not sharply formed, the magazine can be pushed out of being correctly seated if a jam is encountered. That upper edge resists the downward motion from the magazine spring tension or the bolt slamming into a misfeed.