Fab Defense Glock 43 +4 Magazine Extension - Black - The 43-10 is a magazine floor-plate replacement for the Glock 43 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. + 4 Rounds For A Total Of 10 Rounds In The Magazine! 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