In addition to what Formo has correctly stated above, a suppressed AR, wether shooting subs or supers, will measure around 140db at the shooter's ear. You're dramatically reducing your ballistic effectiveness without gaining any significatnly measurable reduction in sound (at the shooter's position) by going to subs. Others in the house will be exposed to less overall noise, but you're not really doing yourself the favor you think you are by going to subs. I'd suggest 110 Barnes or 125 OTM supers that are engineered for performance at BO velocities. 8.5"-10.5" barrels, IME.
