i got the g20 mag for my g29 (same size as yours). it's the a-grip one from brownells. it's not a seamless transition (there's a slight gap), but it works fine. no pinching or anything.
Yes. It is removable.That's a good point jl, but since I only have one Glock (I know that's shameful, but there's a certain 34 that will fit nicely under my Christmas tree), right now it doesnt matter in my case. I can always remove it correct?
the pic i posted is an a&g that slips over the mag and is held in place with a set screw.There is a company called A&G (I think) that makes a sleeve that goes around the mag to make it all feel like one piece. I have one somewhere for using 23 mags in a 27. It works, but it's really not much different than sticking the mag in there without it; however, it does make it where you can't put the mag into the larger gun thus defeating mag interchangeability.