While spelunking in the USPTO database, I noticed a patent from William E. “Bert” Brown of Powder Springs, GA. Brown is the founder of Talon Armament, and the inventor of their “Clench Grip,” a moldable AR-15 pistol grip.
While Talon Armament is best known for AR-pattern rifles, this patent application is for a fresh-sheet handgun design. What is notable is the use of angled slide rails, allowing for the user to get his hand higher behind the bore axis. In recoil, the slide will cycle up and to the rear. Think of it as the JatiMatic SMG crossed with a conventional short-recoil handgun.