Shield Arms S15 Gen 3 15 Round Glock 43X/48 9mm Luger Pistol Magazine Black 1 Pack Steel 15RD. The S15 is a steel magazine and is the same length as the OEM Glock 10 round magazine but holds an additional 5 rounds. Modular tooling. Raised ribs on the back of the magazine allows these to fully match the OEM magazine position in the mag well which should eliminate any tolerance stacking that results from Glock frame variations. Specifications for Shield Arms S15 Gen 3 Glock 43X/48 9mm Luger 15 Round Pistol Magazine: Manufacturer: Shield Arms Gun Make: Glock Gun Model: Glock 48 Glock 43X Caliber: 9mm Luger Magazine Capacity: 15 Round Color: Black Condition: New Fabric/Material: Stainless Steel Package Contents: Shield Arms S15 Gen 3 Glock 43X/48 9mm Luger 15 Round Pistol Magazine What firearm models does the manufacturer say Shield Arms S15 Gen 3 Glock 43X/48 9mm Luger 15 Round Pistol Magazine is compatible with? The manufacturer says that Shield Arms S15 Gen 3 Glock 43X/48 9mm Luger 15 Round Pistol Magazine is compatible with Glock 43X Glock 48Shield Arms S15STARTERKITG3-15RD: S15 Gen 3 15 Round Glock 43X/48 9mm Luger Pistol Magazine Black 1 Pack Steel