I carry a Glock 21 Gen 3.
The holster is alien gear 2.0. I have an IWB holster and a outside one, but currently I am wearing the OWB holster.
I carry the Glock 21 Gen 3 because I like the full size frame in a 45 acp and I have no problems concealing it in the summer or winter. Since the weather is cooler now I am able to wear the holster which goes outside the waste band because my winter jacket conceals it perfectly.
Ps: My glock is loaded with federal hst 230 gr ammo.