[Celena Luna]

it can't be fix with the amount of stuff you give us.
There are problems:

gxm_item_enabled(id) - I assumed it will only give the weapon when it enabled

=> Everytime you respawn, you have to give the gun again
=> But then you don't know if player unlocked it or when player passed it and change to other weapon
=> You can't catch the right time to give the player weapon again.