Armscor Lion Principal SA, Semi-automatic Shotgun, 12 Gauge, 3 Chamber, 28 Barrel, Black Synthetic Stock, Bead Sight, 5 Rounds, Includes 3 Chokes - Full, Modified and Improved Cylinder P-100 The P-100 is a semi-automatic shotgun that features a 28" barrel, synthetic stock, black anodized finish and a 3" chamber.