Installation:

Drag and drop in your scripts folder, if you don't have one, install scripthookdotnet first.

USAGE:

-Just start the game up, you will only have one weapon of each type, just like in previous gtas like IV and San Andreas.
-Weapons which are picked up from the ground will also replace your current weapon, so I recommend useing something like this: https://www.gta5-mods.com/scripts/manual-pickups-hkh191
or this https://www.gta5-mods.com/misc/immersive-pickups

Makes it worth using mods such as:

https://www.gta5-mods.com/scripts/tws-trunk-weapon-storage.

The help text can also be disabled in the ini with the "messageenabled" setting by setting it to false.