If you like to tinker or play with things, stay away from the pinned 14.5. Changing out comps is a PITA on 14.5" barrels. I run an 18" on everything because I like one setup and don't practice enough to switch between two. Most of the club and major matches I shoot at go out to 600 yards. I've got a Larue 18" thats sub MOA and works great for me.