what 500 and 999 exp i use it 1 time only and i get 400.000 and from Master Sergeant 3 goes to
Major 3 with 1 time only 2 minutes
i use AVA's Best Injector
https://www.mpgh.net/forum/201-allian...-injector.html
and i inject 6 dll.sits easy you get major in 5 min