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 onlyEnables a full grip on the handgunContoured finger indents for a firm grip during magazine manipulationInnovative spring plate allows the use of the original magazine springFiberglass reinforced polymer constructionWeighs 37 grams