I have a gen4 Glock 22 (full sized) and a gen 3 Glock 27 (subcompact). I want to purchase a 40-9 conversion barrel for one of them. I do not mind shooting the 27 with the longer 22 mags, and the 27 has a Crimson Trace laser grip. I would like to hear opinions on which you would buy the new barrel for and why. I do not mind having the extra magazine length sticking out the bottom of my 27 so that is not really a concern. If I buy it for the 22, then I can only buy 17 mags. If I buy it for the 27, I can buy 17, 19, and 26 magazines. Thank you all in advanced for the input.