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The Mossberg 500 is a shotgun manufactured by O.F. Mossberg & Sons . more...

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Rather than a single model, the 500 is really a series of widely varying hammerless, pump action repeaters, all of which share the same basic receiver and action, but differ in bore size, barrel length, choke options, as well as stock and forearm materials.

Basic features

All modern 500s are based on the same basic design, using dual action bars, which are (at least in theory) less likely to bind than a single action bar design, and a single large locking lug to secure the breech. The magazine tube is located below the barrel, and is screwed into the receiver. The slide release is located to the left rear of the trigger guard, and the safety is located on the upper rear of the receiver (often called a "tang safety"). Sights vary from model to model, from simple bead sight to a receiver mounted ghost ring or an integrated base for a telescopic sight. Most models come with the receiver drilled and tapped for the installation of a rear sight or a scope base. The factory scope base is attached to the barrel via a cantilever-type mount, which places the scope over the receiver but keeps it with the barrel if the barrel is removed.

Intended for use in harsh and dirty conditions, such as waterfowl hunting or combat, the Model 500 series is designed to be easy to clean and maintain. All Model 500s feature interchangeable barrels which may be removed without the use of tools, by loosening a screw on the end of the forend, which allows the barrel to be removed. The bolt locks into a locking lug located on the top of the barrel, ensuring a solid bolt-to-barrel connection and not relying on the receiver for any locking strength. The trigger guard can be removed by pushing out one retaining pin, and pulling downwards. The elevator can be removed by squeezing the sides together, freeing the pivot pins from the receiver. The pump can then be moved to the rear, allowing the bolt and bolt carrier to drop out, and then the pump can be removed by moving it forward. The cartridge stop and interrupter will then fall free, leaving just the ejector and the safety in the receiver, held in by screws. The magazine spring and follower may be removed by unscrewing the tube from the receiver. This level of field stripping is sufficient to allow all components to be cleaned.

Model 500 options

The name "Model 500" covers an entire family of pump shotguns designed to chamber 3" (76.2mm) shells. The standard model holds five 2 3/4" (70mm) or four 3" shells in the magazine and one in the chamber. The Model 500 is available in 12 gauge, 20 gauge, and .410 bore, with the 12 gauge being the most popular.

Read more at Wikipedia.org