Well I had a set of gen 3 glock 19 grips and a gen 4 glock 19 so I got to experimenting, and this is what I cam up with. required items glock gen 4 ( proven on 19 may work on full or compact as well) medium back strap cutting tool ( dremel is what I used) gen 5 jentra plug with screw. ok first step grab your cutting tool and medium back strap. cut the back strap at the top right above the stippled texture lines. step 2 install ct grip with provided pin step 3 slide jentra plug into place for use with a back strap do not install the screw yet( refer to included instructions) step 4 slide back strap under ct grip and snap onto bottom of gun step 5 install jentra plug screw ( this will keep the back strap from sliding out under fire) step 6 go zero your girps!