My G-36 will be the perfect 45 carry gun after a trip to Robar for a grip reduction and a new trigger. I tried a new trigger that a local Glock armorer had installed in his and it was wonderful with no mush and an incredibly short reset. I think the 36 will wind up as the perfect commander size 45. To me the Glock 21 is about like trying to shoot a 2X4.