the rollers are in tandem on a single axle and offer more power in a relatively short gun I take exception to that. The length of the gun has nothing to do with the roller design. A roller gun could be 4 miles long and still be more effective than a non roller. In my view rollerguns should have been considered "prior art" when Marc-Antoine Berry took out his recent worldwide patent (2005, application was in July 2004) for single and dual axle rollerguns with two-stage loading, those ideas were known well before then, but no one bothered to patent them. I'm not a patent attorney but an invention cannot be common practice art. Just being the first to patent an invention is not the full requirement. use a small diameter band and the muzzle band arrestor can crack when struck by the metal wishbone. You assume that the wish bone is metal. We know better than that now. There was also a tandem roller version, but I doubt that many of those were sold. The band runs the full length of the barrel, both top and bottom, anchoring just in front of the trigger finger guard. In my opinion, this will be the future of band guns. The advantages are many.
Patent holders do not have to think up an idea first, they just have to get to the Patent Office first! We don't agree on this. And spend the necessary money to register and protect their patent. Improvement is continual and hence the whole basis for patents. Building a good product and making money as quickly as possible not protection is the key because when the product is continually improved one stays ahead of the competition.
I appologize for not knowing how to use the "quote" jig-a ma-thing.