I have acquired a Glock 40 10mm and like it very much but I want something to carry a little easer like a Glock 20, not really wanting to buy a new Gun BUT Should I just get a good holster for the 40 or invest in the 20, I could get a longer barrel for the 20 and put it on if I ever needed it. Or get a 20 slide and put it on the 40, What is your thoughts on is?