Im looking at getting a top tier upper that will be used suppressed pretty much all the time with my Sandman K or S. It will be my go to all purpose rifle. Im looking at the KAC SR15 Mod 2 11.5 and PWS MK111 Mod 2 11.8 uppers. For those of you who shot or own both, which would be the better upper for 100% suppressed hard use rifle? Is the PWS superior due to the piston/adj gas block design?