[Mr. Mojo]

I also have been wondering about .223 silencers and their effect on velocity/range, and no one I've asked seems to know. To my knowledge, not a single witness has heard a single shot. There's no doubt the Feds are keeping a stranglehold on the details.

[Travis McGee]

Suppressors (no such thing exists as a true "silencer") can acutally improve accuracy, but they will give the barrel a different zero than without a suppressor.

[.308 PSS]

http://www.advanced-armament.com/ (Silencers for many rifles/handguns)