Fellow gun-freaks, I have a suppressor question for you. I have a Ruger SR-556, and I'd like to get a suppressor for it. I've heard that a lot of guys buy a .308 suppressor and use it on multiple guns, including their AR-15s. First, does a .308 suppressor mounted on a 5.56 rifle work as well as a 5.56 suppressor? If not, how much noise reduction and/or accuracy is sacrificed by doing this? Second, what suppressor brand/model do you recommend, and why? Also, for the sake of not creating another thread, what suppressor do you recommend for a Springfield XD .45ACP? Thanks!