credits to teh_bandit, i just copied the sourcecode for the staminup and mulekick weapon save from his cold war mod
his thread : https://forum.plutonium.pw/topic/15807/release-zombies-cold-war-mod-final-update
put in %localappdata% > plutonium > storage > t6 > scripts
https://www.mediafire.com/file/9uzxkpmxv9xgdvx/unlimited_sprint_%252B_weapon_save.rar/file
source code included
just to clarify, mule kick save weapon makes it so if you die with mule kick and the 3rd gun disappears, after you buy mule kick again the gun you lost is brought back into your inventory