With my SpectreII on my CZ455 the striker hitting the rim is louder than the report of the rifle with ammo less than 1050fps. If I shoot mini mags the sonic crack defeats the point of the can.
Gemtech is made by CCI for them under contract. I find the federal 45 grain suppressor rds more accurate in my guns than the CCI subsonic or CCI quiet semi auto. federal bought CCI about 2 years ago. I believe the federal suppressor is made by CCI for federal.