Weapons-player.rpf

It configures the properties of different ammo types:

Before you go wild, a few important disclaimers: WEAPONS-PLAYER.rpf

Never, ever edit the original WEAPONS-PLAYER.rpf inside the x64v.rpf directory. It configures the properties of different ammo types:

If you corrupt or improperly replace this file, GTA V will crash on startup or the moment you draw a weapon. Always use OpenIV (the essential modding tool) with "Edit Mode" enabled, and work exclusively inside a mods folder copy. Never, ever edit the original WEAPONS-PLAYER

Replace the default assault rifle model with a custom skin and updated aim-down-sights animation: