Pachmayr Grip Extenders adapt magazines intended for use in full size pistols to work in compact and subcompact pistols for many popular models. This not only increases the magazine capacity for the compact or subcompact, but also increases the size of the grip, giving the shooter more control and a more comfortable shooting experience. Simply slide the extender over the magazine for a secure fit.Features: This is not a Glock Factory Product, it is an after market Product Pachmayr 03850 Polymer construction Slip on installation BlackFits: Adapts Glock 17/22/31 magazines for use in Glock 19/23/32