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Weapons
Grants apply to the current protagonist. Mission-restricted weapons can disappear when a script takes over.

Grant
Pick a weapon, confirm, check the wheel. If it is missing, the mission forbids it.
Ammo
Fill, not infinite by default on modest builds.
Melee vs guns
Same tree. Do not dump a minigun into a stealth beat unless you mean it.
FAQ
Did it wipe my loadout?
A checkpoint restored the mission kit. Re-grant after.