The 42-10 is a magazine floor-plate replacement for the Glock 42 that adds 4 rounds for a total of 10 rounds in a magazine. Special ergonomic design enables secure manipulation of the magazine and a full grip on the weapon when the magazine is in use. Features: Glock 42 only Enables a full grip on the handgun Contoured finger indents for a firm grip during magazine manipulation Innovative spring plate allows the use of the original magazine spring Fiberglass reinforced polymer construction Weighs 37 grams