Recoil-operated semi-automatic shotgun was another variation of early production Auto-5. Chambered for 12-, 16- or 20-gauge. Manufactured by Remington Company for Browning. Quite similar to Remington's Model 11 shotgun. Features Browning logo and different type of engraving. Approximately 45,000 manufactured between 1940 and 1942. NOTE: Add 20 percent for ventilated rib; 10 percent for 20-gauge.