KRISS USA Mag-Ex2 Glock 20/40 Gen 3-5 Pistol Magazine Extension Kit 10mm Auto 33 Round Black 1 Pack Polymer. The kit is made up of the extended baseplate outer sleeve and extended spring constructed of durable and lightweight reinforced composites. Combining the Mag-Ex Kit 2 with the factory standard Glock magazine body and follower is a perfect match of reliable feeding toughness and aesthetics for the KRISS Vector. NOTE: This is a kit only; magazine body and follower not included. Specifications for KRISS USA Mag-Ex2 Glock 20/40 Gen 3-5 10mm Auto 33 Round Pistol Magazine Extension Kit: Manufacturer: KRISS USA Color: Black Fabric/Material: Polymer Magazine Capacity: 33 Round Caliber: 10mm Auto Gun Make: Glock Gun Model: Glock 20 Package Contents: KRISS USA Mag-Ex2 Glock 20/40 Gen 3-5 10mm Auto 33 Round Pistol Magazine Extension Kit What firearm models does the manufacturer say KRISS USA Mag-Ex2 Glock 20/40 Gen 3-5 10mm Auto 33 Round Pistol Magazine Extension Kit is compatible with? The manufacturer suggests that KRISS USA Mag-Ex2 Glock 20/40 Gen 3-5 10mm Auto 33 Round Pistol Magazine Extension Kit is compatible with Glock 20KRISS USA KVAMX2K10BL00-33RD: Mag-Ex2 Glock 20/40 Gen 3-5 Pistol Magazine Extension Kit 10mm Auto 33 Round Black 1 Pack Polymer