Glock G21/41 Pistol Magazine .45 ACP 13 Round Black 1 Pack Polymer MF21013-13RD. Specifications for Glock G21/41 .45 ACP 13 Round Pistol Magazine: Manufacturer: Glock Gun Make: Glock Gun Model: Glock 21 Caliber: .45 ACP Magazine Capacity: 13 Round...