Take a look at another HPA-conversion of a Nerf Gun by Bingo Airsoftworks using the Wolverine Airsoft SMP this time... "The Wolverine SMP powered Nerf Rhino-Fire is a very fun but frightening airsoft gun. The larger hollow out barrels of the Nerf gun amplify the sound of each shot making this HPA airsoft gun one of the loudest I’ve used.