Mec-Gar Usa Inc Mec-Gar Plus-2 Adapter Set for Mec-Gar Magazines ONLY Full Size Glock 9mm Luger Full Size Magazines Black. Contains1 Polymer Plus-2 magazine extender1 Phosphate steel locking plate heat-treated1 Type D music wire spring1 High-visibility green polymer followerTHIS ITEM WILL ONLY WORK ON THE MAGAZINES LISTED BELOWMec-Gar Magazine for Glock 17 9mm 18rd MGG171800A Adds 2 roundsMec-Gar Magazine for Glock 17 9mm 10rd MGG171000A Does not add capacityMec-Gar Magazine for Glock 19 9mm 18rd MGG191800A Adds 2 rounds Specifications for Mec-Gar ''Plus-2'' Adapter Set for Mec-Gar Magazines ONLY Full Size Glock 9mm Luger Full Size Magazines Black 92574730: Manufacturer: Mec-Gar Caliber: 9mm Luger Magazine Capacity: 2 Round Package Contents: Mec-Gar ''Plus-2'' Adapter Set for Mec-Gar Magazines ONLY Full Size Glock 9mm Luger Full Size Magazines Black Replacement floorplate set to increase the capacity on select Mec-Gar Glock Series of magazines.Contains1 - Polymer "Plus-2" magazine extender1 - Phosphate steel locking plate heat-treated1 - Type D music wire spring1 - High-visibility green polymer followerTHIS ITEM WILL ONLY WORK ON THE MAGAZINES LISTED BELOWMec-Gar Magazine for Glock 17 9mm 18rd - MGG171800A - Adds 2 roundsMec-Gar Magazine for Glock 17 9mm 10rd - MGG171000A - Does not add capacityMec-Gar Magazine for Glock 19 9mm 18rd - MGG191800A - Adds 2 rounds F42354-SET-BLK