Remington Model 1100
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The Remington Model 1100 is a gas-operated semi-automatic shotgun introduced by Remington Arms in 1963. Wikipedia
Model years: 1963
Action: Semi-automatic, gas-operated
Barrel length: 18 to 30 inches (460 to 760 mm)
Cartridge: 12, 16, 20, 28 gauge, and.410 bore
Designer: Wayne Leek & Robert Kelley
Manufacturer: Remington Arms
No. built: 4,000,000