Can you silence a 50 cal sniper?

Answer 1

Sure, just put a piece of Duct Tape over his mouth. Ha ha. On the other hand, his weapon is a different story. The size of the round and the velocity with which it displaces air around the muzzle makes it pretty much impossible to silence. If you custom loaded a very slow (subsonic) round, then you should be able to make a suppressor that would reduce (not eliminate) the sound. Unfortunately, reducing the velocity would also reduce the range and impact effects, which is why snipers like the .50 in the first place. If you saw it in a movie, keep in mind that all things are possible in Hollywood.