for clarity sake.... an assault weapon (I am not expert on all the names and nuances but one that shoots automatically and has large annunciation capacity for instance, silencers, night sights probably, adaptation for launching grenades) should not be owned or used by folks (other than the military or police types). They should not be used for target shooting or hunting of animals. Now whether a given weapon is proper for large police forces or should be restricted to military use is another issue and for instance a rocket launcher should not be in the police arsenal but brought in specially from/thru/by the military if there is some unique need.
99% of the problem with these discussions is people just don't know what they don't know. To wit, Dr. Yakimow is correct:
Automatic weapons are already banned (for those manufactured after 1986) and highly, highly regulated for automatic weapons manufactured before then. That one can just walk in and purchase an automatic weapon is a myth that just won't die. Here's an article that will help you understand the distinctions in the gun control debate as to what current law already says regarding automatic weapons. I've yet to hear someone argue for changing it or making automatic weapons easier to purchase.
For the record, police don't usually have those either. They use self-loaders. With the possible exception of SWAT teams.
Now, the semi-automatic version of these rifles are used frequently in patrol cars. That is because they are light, modular, have low recoil, do not penetrate as much as even a shotgun with buckshot, accept implements such as forend lights and a wide variety of glass, and are generally great for defensive use. I'm a little surprised to see you list "night sights" among your list of frightening things, though, Pastor Mozolak. Every pistol in my house has those, and I'm not exactly sure why they are a bad idea. Not to be rude, but I don't think you're sure either.
Suppressors are already controlled in the exact same way as automatic weapons, which is to say, it's very, very difficult to get one. I'm honestly not sure how easy it is to get a grenade launcher, but I'd wager it's awfully difficult to get grenades, so if someone wants a glorified potato cannon on the front of their rifle for some reason, I'm also not sure I'm really opposed to that.