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Cross Armory Glock 3 Piece Kit contains Dimpled Pin Set, Extended Magazine Catch and Extended Slide Lock. The Slide Lock and Pin Set is made of 4140 Steel, the Magazine Catch is made of Aluminum. Does not interfere with gun holster. Fits Glock Gen1-3 models 17, 19, 20, 21, 22, 23, 24, 26, 27, 29, 30, 31, 32, 33, 34, 35, 38 & 39. *Note- Does not fit 42, 43, 43x.