The Mec-Gar Bersa Thunder .380 ACP 8rd Blued Magazine features an increased capacity of 8 rounds. The carbon steel tube is heat treated for strenght and this magazine features a higher tensile music wire spring with a steel follower. This magazine also features a polymer finger rest removable butt-plate. Please note this magazine is not for use with Bersa Concealed Carry model. Caliber: .380 ACP Increased Capacity of 8-rounds Carbon Steel Tube, heat-treated for strength Higher tensile music wire spring Steel follower Polymer Finger Rest removable butt-plate Not for use with Bersa Concealed Carry model