Glock G17/34 9mm Luger 33 Round Pistol Magazine Black w/Orange Follower 1 Pack 33. Often the last round will not fit until the magazine has undergone a break-in period. It is recommended that the magazine be loaded with all but the last round and left for a few days to compress the spring. Cycling the magazine from full to empty multiple times can assist in the break-in period. Specifications for Glock G17/34 9mm Luger 33 Round Pistol Magazine: Manufacturer: Glock Gun Make: Glock Gun Model: Glock 17 Caliber: 9mm Luger Magazine Capacity: 33 Round Color: Black w/Orange Follower Fabric/Material: Polymer Package Contents: Glock G17/34 9mm Luger 33 Round Pistol Magazine What firearm models does the manufacturer say Glock G17/34 9mm Luger 33 Round Pistol Magazine is compatible with? The manufacturer says that Glock G17/34 9mm Luger 33 Round Pistol Magazine is compatible with Glock 17Glock 65971: G17/34 9mm Luger 33 Round Pistol Magazine Black w/Orange Follower 1 Pack 33