Does a silencer/suppressor effects accuracy in any negative way?
Using a suppressor can improve your accuracy, for a couple of reasons. First, they help to reduce muzzle rise, which means you can stay on target more easily after each shot. Second, they can help to reduce recoil, making it easier for you to control your weapon and make follow-up shots.
Of course, ultimately it depends on the individual shooter and the specific gun being used. Some people find that suppressors make very little difference in their accuracy, while others find that they are invaluable. Ultimately, it comes down to preference and experimentation to see what works best for you.