So I already have a aero upper and lower.
Sba3 pistol brace
Rosco 11.5 barrel Carbine length has system
Slr adjustable gas block

Solgw lpk
Trigger already sorted out
Midwest handguard

Have a standard carbine gas tube and spring on hand

What buffer and spring would you run in a 11.5 for suppressed use primarily, but need reliability Unsuppressed as well. I know I can adjust the gas tube but want smooth reliable function

Mid to full power loads.

Thanks guys