Add the "get smoke grenade launcher.lua" file to script/addins you will need to have lua plugin
Replace "weaponanimations.meta" and 'weapons.meta" at GTAV/update/update.rpf/common/data/ai
Go to update/update.rpf/x64/data/metadata
and there replace explosion.ymt
To get the launcher you have to press "N".If you go to weapon wheel the smoke grenade launcher will disapear and to get it back press again "N"