This is a Armscor Magazine known as the ACT-MAG chambered in 22 WMR, model FG22MA.
The ACT-MAG 22MAG Magazine is a standard factory replacement magazine. This magazine is for 1911 models chambered in 22 Magnum and holds 14 rounds of ammunition. It is made of polymer and is made to Armscor/Rock Island Armory specifications and tolerances" using the same manufacturing and materials as the original equipment magazines" ensuring perfect fit and operation.
Features:
Steel Magazine Body
Polymer Base Plate
Perfect Fit and Operation