Fixes #676

code/modules/projectiles/targeting/targeting_mob.dm

@@ -1,6 +1,20 @@
 /mob/living/var/obj/aiming_overlay/aiming
 /mob/living/var/list/aimed = list()
 
+/mob/verb/toggle_gun_mode()
+	set name = "Toggle Gun Mode"
+	set desc = "Begin or stop aiming."
+	set category = "IC"
+
+	if(isliving(src))
+		var/mob/living/M = src
+		if(!M.aiming)
+			M.aiming = new(src)
+		M.aiming.toggle_active()
+	else
+		src << "<span class='warning'>This verb may only be used by living mobs, sorry.</span>"
+	return
+
 /mob/living/proc/stop_aiming(var/obj/item/thing, var/no_message = 0)
 	if(!aiming)
 		aiming = new(src)