The trigger assembly, which includes the trigger, hammer, sear, and trigger body with guard, can be removed by pushing out one retaining pin and pulling downwards on the guard (if a pistol grip is installed, it usually must be removed first as virtually all such grips obstruct the removal of the trigger body). 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. All Model 500s feature interchangeable barrels (given a particular gun's mag capacity a barrel designed for a 5-shot tube will not fit a gun with a 7-shot tube) which may be removed without the use of tools, by loosening a screw on the end of the magazine tube, which allows the barrel to be removed.
MOSSBERG 500 SERIAL NUMBERS SERIES
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. 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. Most models come with the receiver drilled and tapped for the installation of a rear sight or a scope base. Sights vary from model to model, from simple bead sight to a receiver mounted ghost ring or an integrated base for a telescopic sight. 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"). The magazine tube is located below the barrel, and is screwed into the receiver. A single large locking lug is used to secure the breech. Originally using a single action bar this was changed to dual action bars in 1970, which are (at least in theory) less likely to bind than a single action bar design. Introduced in 1961, all model 500s are based on the same basic design. Marines assigned to Commander, Seventh Fleet, Fleet Fleet Anti-terrorism Security Team (FAST), Third Platoon, familiarize themselves with the M590 shotgun Other model numbers included in the 500 series are the 590, 505, and 535. The 500 series comprises widely varying models of hammerless, pump action repeaters, all of which share the same basic receiver and action, but differ in bore size, barrel length, choke options, magazine capacity, and "furniture" ( stock and forearm) materials. Mossberg 500 is a series of shotguns manufactured by O.F.
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