After some snooping around, it appears that the King Arms WA M4s use a clone of the prowin hop up: http://www.evike.com/product_info.php?products_id=36013 Evike sells the rubbers separably http://www.evike.com/product_info.php?products_id=36034 Sadly I can't afford the $71 it cost to ship to Canada. 
Edit: Nevermind, places like Ehobby have them in stock!
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Last edited by THe_Silencer; February 9th, 2012 at 04:17..
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