Most players go with assault rifles like the AKM and the M16A as their primary weapons, with sniper rifles in tow for taking out players without exposing themselves to danger. In either case, and with most of the other guns in the game, you’re going to need scopes. The iron sights on most guns are kind of abysmal, and since PUBG is such a big game that covers so much space, you’re going to want any help you can get in aiming at a distance.
Suppressors, too, are game-changers. When you fire a gun, everyone can hear you in a huge radius. You’ve already experienced this going through the game, hearing distant gunshots. That advertisement tells people where to go, or where not to go. Sound is an incredibly important part of finding and killing people in PUBG, and you want to make as little of it as possible. Hence, suppressors.