I've been considering a OWB kydex holster for a Glock I have that I built from a empty frame. Problem is, I don't know which one to buy cause the gun is a hybrid/Frankenstein. It's a Gen3 21SF frame, with a Lone Wolf "20L" as they call it slide, and the matching Lone Wolf barrel. I've been thinking the G40 holster would work, but I'm not sure enough that I can justify spending the money on a guess. What say you ladies/gentlemen? I'm including pics of the lengths of everything to give a better idea.