Defiantly stay away from the ported barrel. I built a Open Glock 17L for a buddy of mine & it was kinda hard to make run consistently because the slide was soooooo long! He eventually bought a G17 slide & barrel & used his original comp. Now he is experimenting with comps, Jager, Carver (both minor & major) & SJC. His gun makes major with 3 powders, Power Pistol, HS6 & AutoComp with 124grn JHP's. AutoComp is the most consistent of all & feels the best to both him & I. He started his build using the Leupold Delta Point (bigger window then STS), but has switched to the SJC Mount & a full size C-More. If you want to do it on the cheap, buy a threaded barrel, a comp, which sight you like & a magwell, built some magss & have fun! Don't spend a ton of $$ if your only going to shoot it every once in awhile. Hope that helps