The Kriss Mag-Ex kit 2 is the ultimate capacity extending base plate for your factory standard glock magazines. The Kriss Mag-Ex Kit 2 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. Due to spring tension, hand-loading ammunition into extended capacity magazines becomes increasingly difficult the more you load. We highly recommend the use of a magazine loader such as the UpLULA.