The new Brownings operating system is a knock-off of the Benelli design. Benelli calls its system Inertia Driven which utilizes recoil of the shotgun and the inertia of a floating bolt to compress the bolt head spring. The patent expired on the system, but not the trademark, so Brownings term of art for its system is Kinematic Drive which is a registered trademark and also refers to it being a short recoil system. The below article linked below describes the Benelli concept in detail. Paolo Benelli invented the Inertia system in the 80s and was granted a patent for it in 1986 (Patent #4604942), thus preventing any competitors from incorporating it into their designs. I believe Browning is the second company outside the Benelli/Beretta family of companies to produce a shotgun using the Inertia system since the patent expired in 2006. Quoted material from the Thefirearmblog.com
Still available for trademark is the Doofus Drive in honor of the man who interjected the A-5 into this thread.
http://www.chuckhawks.com/benelli_inertia_action.htm
