Description
CMMG’s Mk4/AR15 .22 LR conversion magazine is built around the same internal geometry as CMMG’s original 22ARC magazine design, which means the feed angle and follower geometry are already dialed in for reliable rimfire feeding rather than adapted from a centerfire design as an afterthought. That matters in a conversion context because the .22 LR rim demands precise stacking and a feed path that accounts for the cartridge’s proportions — get that geometry wrong and you see nose-dives and failures to feed before the first box is empty.
The polymer construction keeps weight low, which is a practical consideration when running a dedicated rimfire lower or a conversion kit for training purposes — the magazine itself isn’t adding meaningful heft to a platform already lighter than its centerfire counterpart. The body is molded in Flat Dark Earth to coordinate with CMMG’s FDE firearm and conversion kit lineup, so it doesn’t stand out visually against a matched build.
Compatibility extends beyond CMMG’s own Mk4 receivers to mil-spec AR15 lower receivers generally, making this a workable option for shooters who run a conversion kit on a non-CMMG host. The 10-round capacity suits ranges or contexts where a low-profile magazine is preferable — the shorter stack sits closer to the receiver than a 25-round option and interferes less with supported shooting positions or rest-based work.




