Elite Force Glock 17 Gen4 20-Round Gas Blowback Airsoft Magazine Black. These Airsoft Magazines by Elite Force contain 20 rounds of 6mm airsoft BBs that are guaranteed to cycle properly in each and every shot. This Elite Force Glock 17 Gen4 20-Round Airsoft Magazine is compatible with aftermarket extensions (such as pistons and compensators) that require the magazine to have specific physical measurements in order to fit properly. If you're looking for a magazine that fits your Glock 17 Gen4 look no further than this Elite Force Glock 17 Gen4 20-Round Airsoft Magazine. Specifications for Elite Force Glock 17 Gen4 20-Round Gas Blowback Airsoft Magazine: Manufacturer: Elite Force Color: Black Fabric/Material: Metal Magazine Capacity: 20 Round Gun Make: Glock Gun Model: Glock 17 Gen 4 Glock 17 Model Generation: 4 Projectile Caliber: .243 Caliber Package Contents: Elite Force Glock 17 Gen4 20-Round Gas Blowback Airsoft Magazine What firearm models does the manufacturer say Elite Force Glock 17 Gen4 20-Round Gas Blowback Airsoft Magazine is compatible with? The manufacturer suggests that Elite Force Glock 17 Gen4 20-Round Gas Blowback Airsoft Magazine is compatible with Glock 17 Glock 17 Gen 4Elite Force 2276302: Glock 17 Gen4 20-Round Gas Blowback Airsoft Magazine Black