CZ Custom CZ Base Pad Czech Mate/Tactical Sports 170 mm 3 Round Magazine Extension Black. Fits the USPSA gauge and is 170mm for IPSC Open Division. When using the new CZC Spring and Follower 13 coil kit CZ Custom has fitted 29 rounds of 9mm in the magazine. This is the base pad and keeper ONLY does not include the magazine. Specifications for CZ Custom CZ Base Pad Czech Mate/Tactical Sports 170mm 3 Round Magazine Extension: Manufacturer: CZ Custom Color: Black Fabric/Material: Aluminum Magazine Capacity: 3 Round Caliber: 9mm Luger Gun Make: CZ Gun Model: CZ 75 TS Czechmate CZ 75 Tactical Sport Gun Type: Pistol Package Contents: CZ Custom CZ Base Pad Czech Mate/Tactical Sports 170mm 3 Round Magazine Extension What firearm models does the manufacturer say CZ Custom CZ Base Pad Czech Mate/Tactical Sports 170mm 3 Round Magazine Extension is compatible with? The manufacturer suggests that CZ Custom CZ Base Pad Czech Mate/Tactical Sports 170mm 3 Round Magazine Extension is compatible with CZ 75 Tactical Sport CZ 75 TS CzechmateCZ Custom 10119: CZ Base Pad Czech Mate/Tactical Sports 170mm 3 Round Magazine Extension Black