This mod, adds the M203 standalone grenade launcher for the AMCAR rifle in the custom fire section. A change of model was used for the modification to fit correctly with the weapon and to avoid that it crosses the parts of the weapon.
I was not able to put independent ammo, therefore it expends 15 of ammo for each projectile. (If someone finds the way, can add freely).
This mod can serve as a template to add this upgrade to any weapon, including Custom Weapons. Modifying the model is something really simple to do.
To change a projectile, only press the key custom fire (usually "V")
This mod, fits seamlessly to any weapon skin
Special thanks to Killerwolf for their inventory icon ^^ and Dr_Newbie (Original lua code for GL Mod)