Since a bunch of randoms are on here trying to sell the simplest lag switch tool, I decided to release the method for free, since it's probably the easiest thing to accomplish and has been available for years with many games.
1) DOWNLOAD & INSTALL NETLIMITER. I am using NetLimiter 4 64 Bit.
2) Start PUBG
3) Go back to NetLimiter, open "Activity" tab and find Tslgame.exe
4) Right click -> Add rule
5) Use these settings & Save
You have now succesfully created a lag switch. Now, how to use.
Make sure you are facing the enemy, and do not use for more than 10 seconds!
1) Alt Tab out of PUBG to NetLimiter
2) Go to 'Rules' tab
3) Right click your rule and hit 'Enable'
4) Shoot the enemy in the head a few times
5) Tab back out of PUBG into NetLimiter
6) Disable rule
Rinse and repeat. You can change the "512" if it does not work that well with you. Certain internet connection speeds respond differently to other limitations, so feel free to experiment. This won't work as well as it used too since it was slightly patched, but it does still work. Your window of opportunity for a kill isn't as wide, and sometimes the hit reg is off.
Any questions, let me know.
UPDATE:
Looks like this is being patched boys.. R.I.P.