Does it reduce damage on the Assult rifles? If you dont do it does your weapon do more dmg?

AFAIK, it just silences your wpn to keep you off the radar.

I think that would be the traditional FPS thing...silencers reducing damage or damage of range. HOWEVER, according to the in-game statistics, it appears that (if these are accurate) adding a silencer only reduces your mobility with that gun, and does not affect damage or range. It seems like thats how attachments work in this game, they dont necessarily adjust the base stats of the gun but will reduce its mobility the more you put on the gun.

For some reason i do better with it off i feel like i kill faster have better accuracey also

Slightly lowers the actual minimum damage

For the Marshall, instead of 30-5, it becomes 30-3 silenced, etc