In PUBG, players who know how to change firing mode of their weapons will unlock great power. Most weapons have different firing modes, enable maximum damage output, but this only true in close range. When you try to fire a whole magazine in long range, it is very hard to hit every bullets because the gun recoil will reduce accuracy. So instead of firing a whole round of bullets, you need to change to Single firing mode, and try to hit one bullet at a time.