The Shield Arms Glock 19/23 Magazine Extension adds 5 rounds to your Glock 19 magazine, and 4 rounds to your Glock 23 magazine.
The MAG-ADAPT 19-17 extends the grip of the pistol to the full-size Dagger when using a 17-round magazine.
Pearce Grip, Grip Extension, Fits Glock Sub-Compact +3 9mm,+2 40 S&W,+1 45 GAP, Black
Pearce Grip, Pearce Grip, Plus-One Grip Extension, Black, Fits Glock 43 High Impact Polymer Increased Comfort and Control Factory Texture Pattern
The MTX by Xtech Tactical is a +5 Magazine Extender that is compatible with H&K VP9 / P30 factory magazines and installs in seconds.