Does anyone have a Comp-Tac holster for Gen4 G21? An used Gen4 G21 followed me home last week, and I want a Comp-Tac holster. However, I am not sure which one to order for Gen4 G21. There are: 20/21 20/21 SF 21SF 1/ 1913 Picatinny Rail I know it is not the 21 SF w/ 1913 PR. I called Comp-Tac, and they told me what I need is 20/21 even afterI mentioned that the Gen4 21 grip size is the same as SF. I want to hear from someone who uses Comp-Tac holster for Gen4 G21. Anyone?