I want a CR Speed holster for a Glock. Looking for a used one maybe. Does it have to be the "G" model to fit a Glock? I would like a 2001 (versa-hanger) but rescomp's website says it doesn't fit Glock. Is it just the endcap that's different? Because if that's the only difference I could replace that with the Aredondonaonaoux's muzzle platform. Thanks.