The Remington model 1100 autoloading (semi-automatic) shotgun was first announced in 1963. It replaced in the production at the Remington some earlier autoloaders, such as models 11-48 and Sportsman 58, and since then model 1100 was manufactured and sold in large numbers around the world (more than one million made). Model 1100 is still listed in Remington catalogs in about ten modifications, and is a very popular hunting, sporting, self defense and police shotgun. It offers great versatility and good firepower. The gas operated autoloading action increases the rate of fire and decreases felt recoil, which is a plus for a combat shotgun. It is a very reliable design, and a very flexible, thanks to the wide variety of available accessories, replacement barrels and stocks of various sizes and designs. Remington 1100 was, and still is used by some police departments in USA.
Remington 1100 is a gas operated, semi-automatic, magazine fed shotgun. It was designed using as much parts from the Remington model 870 pump action shotgun as possible. In fact, the model 1100 differs from model 870 mostly in gas operated action, which replaced the sliding forend. Gas cylinder is located around the front part of the magazine tube. Annular gas piston is linked to the action by two action bars. The barrel locking is achieved by the single locking piece, tilting in the vertical plane and engaging the slot in the barrel extension when locked. To unlock the barrel, this locking piece is cammed down and then bolt is retracted by the gas drive, to eject a spent case and to feed a fresh cartridge from the underbarrel tube magazine. Remington 1100 has a bolt catch which locks the bolt in the open position if the magazine is empty. The magazine is loaded through the opening at the bottom of the receiver, and spent cases are ejected through the window at the right side of the receiver. Cocking handle is located at the right side and is mounted on the bolt.
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