Ken,
I have been out of town for a few days and just saw this post.
Wonderful idea. I would be happy to offer my lawyering skills though I am more of a litigator than a patent attorney. Fortunately, I have friends.
I think your original idea with the 28 should not be shelved so fast. As we all know, the 28 is very popular amoung the have to have it all set. More so I think than the 16.
A gun with all three sets of barrels would be spectacular.
Best, RCC

R. Craig Clark
jakearoo(at)cox.net