KRISS MAGEX2 G21 +17RD 45ACP 3PKThe KRISS MagEx2 G21 +17RD 3PK is a value pack of three magazine extension kits designed for Glock 21 . 45 ACP magazines. Each kit in this pack adds 17 rounds to your standard G21 magazine, increasing the total capacity to 30 rounds of . 45 ACP ammunition. Engineered for use with KRISS Vector firearms and compatible Glock platforms, these extensions offer reliable feeding and durability. Features Specs: Caliber: . 45 ACP Capacity Increase: +17 rounds