Tactical shotguns are built for close-quarters defensive and law enforcement use. Most are chambered in 12-gauge and have barrels in the 18-to-20-inch range. Common features include pistol grips, high-capacity magazine tubes, Picatinny or M-LOK rails, and adjustable stocks. Well-known models include the Mossberg 590A1, Remington 870 Tactical, and Benelli M4. Rails accommodate red dot sights, flashlights, and lasers. Most are pump-action or semi-automatic. Materials typically include steel receivers with corrosion-resistant finishes.