How to Disassemble a Mossberg 500 Series Shotgun

Picture of How to Disassemble a Mossberg 500 Series Shotgun
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This Instructable will walk you through the steps of disassembling a Mossberg Pump-action shotgun (models 500,505, 535). Disassembling a Mossberg 500 shotgun can be learned and mastered quickly. It only takes a couple of minutes to disassemble, even if it is your first time attempting this task. The only tool required is a punch or something similar (small screwdriver, Allen wrench, or even a pen). With the shotgun disassembled, its parts can be thoroughly cleaned and inspected. This will keep your shotgun in top working condition, even in harsh environments.

These instructions break the shotgun down into 10 parts. Move your cursor over the parts on image of the disassembled shotgun to see the names of the parts.

Note: You should be familiar with the operations of the shotgun (i.e. Loading and unloading) before undertaking this task.
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Step 1: Clear the shotgun

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Danger: Safety is essential when working with any firearm and ensuring the shotgun is unloaded is a necessary step before beginning disassembly.

1. Make sure the safety is on (safety button pushed reward with no red dot showing)

2. Check the magazine tube to ensure it is clear of any shells

3. Open the Action

a. Depress action lock lever

b. Pull rearward on the forearm

4. Check the chamber area to ensure it is clear of any shells

The shotgun is now clear and it is safe to begin disassembly.

Step 2: Remove the Barrel

Picture of Remove the Barrel
1. Open the action halfway

2. Unscrew (counter-clockwise) the takedown screw

3. Pull forward on the barrel

Note: The Mossberg 500 comes with interchangeable barrels allowing the operator to switch to a barrel that better suits their intended uses. To change barrels simply remove the barrel that is to be changed and attach the desired barrel.

Danger: Barrels of different models and calibers should not be interchanged. This can cause serious malfunctions in the firearm’s operation endangering the operator and those nearby.
Having owned one of these for many years, and knowing how easy it is to do, I must ask; Is there a specific reason you did not remove the magazine?
Your tutorial worked like a champ, it took all the guess work out. I was able to disassemble in less then 10 minutes give or a take a few. Thanks again.
Great detailed breakdown, good work!
zazenergy3 years ago
Awesome! Thank you for showing how to safely work with this weapon.