Hi.. I'm looking at the barrel conversions for my Glock22 to 9mm. Realistically I want just the stock replacement, nothing fancy, just want to shoot 9mm rounds out of it. On several sites that sell conversion barrels, there's different types: Ported, compensated, with/without chokes, 2 port, threaded etc.. and the different lengths with the previous combo's. I have the length part figured out.. but I don't understand why or what a ported or compensated barrel would do for me? I tried looking for a FAQ, but there so much info it's becoming a headache to try and read through everything. Help?? Thank you!