DISREGARD, SELLER LINKED THE WRONG BARREL. I'm picking up a JP15 upper that is a 16 inch barrel, with the rifle length adjustable gas system on it. The lower for which it is destined has a collapsable stock receiver extension on it. Should I plan on putting a Vltor A5 kit on it, or will the adjustable gas block enable me to tune the rifle length gas to work well with the short receiver extension?
I would normally just play with it when I got it, and see what works - but this is a surprise upgrade for my sister (she shoots an aesthetically identical Smith and Wesson VTac upper right now) and I need to be able to upgrade her rifle and adjust it to perfection over the course of a holiday weekend before she leaves. She's not technically oriented and has little patience for malfunctions or "finicky race guns"....if I don't get it right and she has problems during a match with my super-fly upgrade to her previously reliable system, then she's going to be chapped!
So...
..buffer weight?
..A5 kit?
..just shoot it on my similar lower with the ammo she uses and tune the gasblock?
..fresh buffer spring? JP spring?
Any tips would be appreciated. I need to get it right the first time.
Thanks!