I've been looking at my options for my next project.
I already have a 20" A2 Hbar, and the project that is 95% finished is a 10.5" shortie.
I am leaning towards a 16" in an A4 config (rail gas block), caliber wise I was thinking about 6.8SPC.
I've been floating the idea about doing more of the work myself this time.
Is a piston driven upper more difficult to work with than the regular gas tube style?
I have to save up the funds for it anyway, upcoming move takes precedence over everything for now, so I'll have the time to decide.