Gun changes (#4185)

* Various background gun changes

* Forgot to include the sounds, woops

* Fixes some more gun stuff

* Makes the cham gun work again

code/modules/projectiles/guns/projectile.dm

@@ -10,6 +10,7 @@
 	w_class = ITEMSIZE_NORMAL
 	matter = list(DEFAULT_WALL_MATERIAL = 1000)
 	recoil = 1
+	projectile_type = /obj/item/projectile/bullet/pistol/strong	//Only used for Cham Guns
 
 	var/caliber = ".357"		//determines which casings will fit
 	var/handle_casings = EJECT_CASINGS	//determines how spent casings should be handled