Fixes #456

Adds the same check that laser tag guns have for mouth shooting to
practice rifles so that you can no longer suicide with them.

code/modules/projectiles/gun.dm

@@ -249,6 +249,11 @@
 				mouthshoot = 0
 				return
 
+			if(istype(in_chamber, /obj/item/projectile/beam/practice))
+				user.show_message("<span class = 'warning'>You feel rather silly, trying to commit suicide with a practice gun.</span>")
+				mouthshoot = 0
+				return
+
 			in_chamber.on_hit(M)
 			if (in_chamber.damage_type != HALLOSS)
 				user.apply_damage(in_chamber.damage*2.5, in_chamber.damage_type, "head", used_weapon = "Point blank shot in the mouth with \a [in_chamber]", sharp=1)