ok

code/game/machinery/doors/airlock.dm

@@ -780,6 +780,8 @@
 				H.apply_damage(10, BRUTE, BODY_ZONE_HEAD)
 			else
 				visible_message("<span class='danger'>[user] headbutts the airlock. Good thing [user.p_theyre()] wearing a helmet.</span>")
+	else
+		return ..()
 
 /obj/machinery/door/airlock/attempt_wire_interaction(mob/user)
 	if(security_level)

code/modules/projectiles/gun.dm

@@ -167,6 +167,8 @@
 
 /obj/item/gun/afterattack(atom/target, mob/living/user, flag, params)
 	. = ..()
+	if(!CheckAttackCooldown(user, target))
+		return
 	process_afterattack(target, user, flag, params)
 
 /obj/item/gun/proc/process_afterattack(atom/target, mob/living/user, flag, params)