4-Round Magazine Extension for Glock 42The 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. Special ergonomic design enables secure manipulation of the magazine and a full grip on the weapon when the magazine is in use. Advantages Enables a full grip on the handgun Contoured finger indents for