Removing priority overlays, update_icon() splitup for guns.

code/modules/projectiles/guns/misc/beam_rifle.dm

@@ -35,6 +35,7 @@
 	slowdown = 1
 	item_flags = NO_MAT_REDEMPTION | SLOWS_WHILE_IN_HAND | NEEDS_PERMIT
 	pin = null
+	automatic_charge_overlays = FALSE
 	var/aiming = FALSE
 	var/aiming_time = 14
 	var/aiming_time_fire_threshold = 5
@@ -152,13 +153,13 @@
 	current_zoom_x = 0
 	current_zoom_y = 0
 
-/obj/item/gun/energy/beam_rifle/update_icon()
-	cut_overlays()
+/obj/item/gun/energy/beam_rifle/update_overlays()
+	. = ..()
 	var/obj/item/ammo_casing/energy/primary_ammo = ammo_type[1]
 	if(!QDELETED(cell) && (cell.charge > primary_ammo.e_cost))
-		add_overlay(charged_overlay)
+		. += charged_overlay
 	else
-		add_overlay(drained_overlay)
+		. += drained_overlay
 
 /obj/item/gun/energy/beam_rifle/attack_self(mob/user)
 	if(!structure_piercing)

code/modules/projectiles/guns/misc/blastcannon.dm

@@ -41,18 +41,16 @@
 		user.put_in_hands(bomb)
 		user.visible_message("<span class='warning'>[user] detaches [bomb] from [src].</span>")
 		bomb = null
+		name = initial(name)
+		desc = initial(desc)
 	update_icon()
 	return ..()
 
-/obj/item/gun/blastcannon/update_icon()
+/obj/item/gun/blastcannon/update_icon_state()
 	if(bomb)
 		icon_state = icon_state_loaded
-		name = "blast cannon"
-		desc = "A makeshift device used to concentrate a bomb's blast energy to a narrow wave."
 	else
 		icon_state = initial(icon_state)
-		name = initial(name)
-		desc = initial(desc)
 
 /obj/item/gun/blastcannon/attackby(obj/O, mob/user)
 	if(istype(O, /obj/item/transfer_valve))
@@ -65,6 +63,8 @@
 			return FALSE
 		user.visible_message("<span class='warning'>[user] attaches [T] to [src]!</span>")
 		bomb = T
+		name = "blast cannon"
+		desc = "A makeshift device used to concentrate a bomb's blast energy to a narrow wave."
 		update_icon()
 		return TRUE
 	return ..()