The Plus-2 Adapter Set is a replacement floorplate and inner base set to increase the capacity on selected Mec-Gar Optimum Series flush fitting magazines. It is manufactured from durable polycarbonate with a locking plate made with heat-treated phosphate steel. Will only work with Mec-Gar Mags: dimpled MGPB9210 B/N, MGPB9218AFC-Adds 2 rounds, MGPB9220AFC, dimpled MGPB9610 B/N, MGPB9613AFC-Adds 2 rounds, MGPB9615AFC; CZ dimpled MGCZ7510B, MGCZ7517AFC-Adds 2 rounds, MGCZ7519AFC, dimpled MGCZ4010B, MGCZ4012AFC-Adds 2 rounds, MGCZ4014AFC; Sig MGP22618AFC-Adds 2 rounds, MGP22620AFC, MGP2264013AFC-Adds 2 rounds, MGP2264015AFC; Taurus dimpled MGPT9210 B/N, MGPT9218AFC-Adds 2 rounds, dimpled MGPT4010 B/N, MGPT4013AFC-Adds 2 rounds, MGPT4015AFC; Witness-Tanfoglio dimpled MGWIT9SF10B, MGWIT9SFAFC-Adds 2 rounds, dimpled MGWIT40SF10B, MGWIT40SFAFC- Adds 2 rounds