Gas system has no effect on Buffer Spring, Buffer weight/Style, and stock selection.
If that is the case (it isn't) then those guys at JP rifles are idiots and/or shysters, and I really don't think so.
EVERYTHING about an AR's gas/operating system affects everything else.
I just put an upper together, 18in mid-length. Runs great on green tip. Bolt won't lock to the rear on ANY milder load, with a rifle or carbine lower. Change to a lighter buffer in a rifle lower and it'll run anything, even some really mild reloads.
