Your results are to be fully expected if you were using ammo that broke the sound barrier...there is nothing to slow them down in a muzzle can. (the OPTIMA is rated for full auto 5.56mm fire as far as handling the gas volume goes, at 30 onces in weight and almost 9 inches long and 1 5/8 inch diameter its not a small suppressor)
Im sure it was fairly loud with the crack of the bullets...where my pistol has a ported barrel, to keep everything just under supersonic even with Hi Velocity ammo...no matter what(as a contrast in systems.)
a 10/22 or a Walther P22 with a muzzle can is loud with supersonic ammo as well.
just go buy CCI or RWS subsonic( I order it from midway when not availible local)...and it will be like night and day in your AC556 w/muzzle can and .22 kit
Im sure it was fairly loud with the crack of the bullets...where my pistol has a ported barrel, to keep everything just under supersonic even with Hi Velocity ammo...no matter what(as a contrast in systems.)
a 10/22 or a Walther P22 with a muzzle can is loud with supersonic ammo as well.
just go buy CCI or RWS subsonic( I order it from midway when not availible local)...and it will be like night and day in your AC556 w/muzzle can and .22 kit