Rost Martin RM1F 9mm 10rd Magazine

The 10rd RM1F magazine covers states that cap magazine capacity, and it works just as well as a range magazine anywhere else. Steel body with an extended polymer baseplate, scalloped along the base so you can strip it out by hand when it sits tight in the well.

The extended base is what keeps a short stack from leaving a gap under a full size grip, so the pistol still fills your hand with only 10rd in it. Internally it uses the same stack and follower geometry as the 17rd magazine with a shorter spring column, so nothing about feeding or lockback changes. Black finish, drops free, no fitting. It fits the RM1F full size 9mm only, not the slimmer RM1S.