WeaponFireCallback/keyvalues/scripts/weapons/mp_weapon_shotgun_doublebarrel.txt

WeaponData
{
	"OnWeaponPrimaryAttack"							"WeaponFireCallbacks_OnWeaponPrimaryAttack_shotgun_doublebarrel"
	"OnWeaponNpcPrimaryAttack"						"WeaponFireCallbacks_OnWeaponNpcPrimaryAttack_shotgun_doublebarrel"
}