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Military Police System, out of Piney Flats, Tennessee, has come out with a unique select-fire 12-gauge combat/tactical shotgun called the "Auto Assault 12 Automatic Shotgun", or "AA12 Automatic Shotgun". The full-auto-only Auto Assault 12 Automatic Shotgun fires at a relatively slow rate of 300 rpm (rounds-per-minute) and employs the "Constant-Recoil" principle, which is a recoil attenuation/mitigation system that was first invented and patented for utilization in a gas-operated weapon by legendary small arms designer/developer L. James Sullivan for the Ultimax 100 LMG (Light Machine Gun), back in the late 1970's. "Constant-Recoil" allows a lightweight gun to outhit a heavier gun on full-auto.