Metalstorm was an Australian designed system now I believe owned by the Americans....its original weapon was the gun that had a proposed or theoretical RPM of 1 000 000. These sytems are just plain bloody awsome..check out the link dave for the Redback system...named after the great Aussie spider which has haunted us mere mortals in the backyard dunny...LOL.

cheers bullet

P.S dave I believe this would work nicely on your model??

https://www.metalstorm.com/content/view/38/98/