The KRISS Mag-Ex Kit 2 is the capacity extending base plate for your factory standard Glock magazines. 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.