WeaponFireCallback/keyvalues/scripts/weapons/mp_weapon_shotgun_pistol.txt

WeaponData
{
	"OnWeaponPrimaryAttack"							"WeaponFireCallbacks_OnWeaponPrimaryAttack_weapon_shotgun_pistol"
	"OnWeaponNpcPrimaryAttack"						"WeaponFireCallbacks_OnWeaponNpcPrimaryAttack_weapon_shotgun_pistol"
}