Barrel Assembly

Barrels are not interchangeable between model numbers, gauge or capacity. 500, 835 and 590 barrels are interchangeable only with barrels of the same model, gauge and capacity.

CAUTION: Never close the action or pull trigger while barrel is removed as damage could result to the firearm.

To facilitate shipping, some models are packaged with the barrel removed. To install the barrel in the receiver, proceed as follows:

Visually inspect the inside of the barrel to make certain it is free of any obstructions, excessive oil or grease before installation. If you are unable to remove all obstructions, bring the gun to a qualified gunsmith or ship it to the authorized Product Service Center. Failure to do so may result in gun damage and/or personal injury if the shotgun is fired.

Move the safety button fully rearward to the "ON" (SAFE) position (Fig. 2).

All Models: Depress the action lock lever, (Fig. 3) and move the forearm rearward until the front of the bolt is in the middle of the ejection port (Fig. 7).

Caution: Wear eye protection.

Unscrew the magazine cap by turning it counterclockwise.

Slide the barrel takedown mount ring over the magazine tube while guiding the barrel extension portion of the barrel into the receiver (Fig. 4).

Gently rotate the barrel back and forth while pushing the barrel into the receiver.

Slide the barrel into the receiver and tighten the magazine cap, finger tight only. DO NOT use pliers or a wrench to tighten magazine cap.

Slide the barrel into the receiver and tighten the magazine cap, finger tight only. DO NOT use pliers or a wrench to tighten magazine cap.

Mossberg 590 Assemble
If your 590/835 shotgun is equipped with a magazine spring retainer, prior to putting on the magazine cap, assemble the magazine spring retainer over the protruding magazine spring. Push the retainer down-ward inside magazine tube so that the spring retainer is flush with the magazine tube end.

Caution:

The magazine spring exerts pressure on the retainer. Use caution when disassembling.

To disassemble: Pry up at various points around the small hole in the center of the magazine spring retainer. Cup hand over retainer and magazine so as to keep spring and retainer confined. Use caution not to bend or distort the magazine tube end and or threads.

500® Models: Slide the barrel into the receiver and tighten the takedown screw, finger tight only. DO NOT use pliers or a wrench to tighten the takedown screw. A little space between the magazine tube and the takedown mount is normal.

WARNING (all models): Check to be certain that the barrel is fully seated into the receiver by looking through the ejection port. The barrel extension must rest firmly against the corresponding cut in the top of the receiver as shown in Figure 4.

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  • Peter
    What is the fuction of the hole inthe top of mossberg 500 mag tube?
    3 years ago

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