Bought two 5-round Saiga 12ga Pro Mag Industries magazines. Neither of them fit in the Black Tactical Pro Series M Semi-Auto 12 ga. Black Aces says they will fit but they do not. The rear lip on the mag is too wide and will not eject from the weapon. Black Aces has not responded to my email nor will they answer the phone. Gun works well with the Black Aces magazine and high brass shells. Can no find magazines on the Black Aces website.