JimmyRig

Diy modification of rollermag pm mag polymer for the bigger 458 cartridge. Ground down follower, round out mag mouth. Avoiding FTF failure to feed problems 2.23 5.56 40round extended

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Promag magazine roller mag 2.23 5.56 .458 socom radical arms Hexmag AR Stoner spring dismantle follower different beat new magazine ftf fail to feed black butterfly