I just placed an order for the Ameriglo "Hackathorn" front sight post for my glock 21 and am now looking for a good rear sight to pair it with. So far, I am thinking about buying the steel glock rear sight (15$) and installing it backwards, so I have a flat black rear sight picture. Has anyone tried this/do they like the setup? I am only concerned that the Glock rear sight might not be wide enough for the hackathorn. Any advice? I am also looking for a good carry setup for this thing for wintertime. Can anybody recommend a good OWB holster that will fit a 21 + TLR-1?