KCI USA Double Stack Glock Pistol Magazine 9mm Luger 17 Round Black 1 Pack Polymer 17RD. The polymer molding helps to protect the magazine body from damage and deformation from regular use. Compatible with Glock 17/17L/19/19x/26/34/45/47. Specifications for KCI USA Double Stack Glock 9mm Luger 17 Round Pistol Magazine: Manufacturer: KCI USA Gun Make: Glock Caliber: 9mm Luger Magazine Capacity: 17 Round Color: Black Fabric/Material: Polymer Package Contents: KCI USA Double Stack Glock 9mm Luger 17 Round Pistol Magazine KCI USA KCI-MZ007-17RD: Double Stack Glock Pistol Magazine 9mm Luger 17 Round Black 1 Pack Polymer