i agree with dmickey..I have a Glock 23C. Vented barrell and top slide. I guess you could convert yours to a C model. I know you need the vented barrell and topslide, but not sure what else you'll need....
Oh and for those of you wondering. I don't notice much help with the recoil..Honestly, recoil feels about the same as a non "C" model..Lots of flames coming out the top when you fire it too, it makes it hard to see what i'm shooting at.