oh yeah heavier the better. Far as 9mm bcg's i bought a spinta precision blem for $109 and polished it and it has worked flawlessly. it has the removeable weight so you can put a law folder or a silent capture buffer spring in there. Surprisingly enough the cleanest ammo ive found is freedom munitions 135 grain for ~20 cents a around. no where near as much smoke in the chamber as with other cheap rounds through my suppressor