The Mossberg 500 and 590 shotguns are renowned for their reliability and versatility, making them popular choices for hunters, home defenders, and law enforcement officers alike. A crucial component of these shotguns is the slide tube assembly, especially the longer 7 3/4" variant, which allows for extended magazine capacity. This guide provides a detailed overview of the Mossberg 500/590 7 3/4" slide tube assembly, covering its function, common issues, and maintenance.
Understanding the Mossberg Slide Tube Assembly
The slide tube assembly is a critical part of the Mossberg 500/590's pump-action mechanism. It's more than just a tube; it's an integrated system responsible for several key functions:
- Housing the Magazine Spring and Follower: The tube houses the spring and follower that push the shells forward for loading. A properly functioning spring and follower are essential for reliable feeding.
- Guiding Shells into the Chamber: The tube guides the shells smoothly from the magazine into the receiver, ensuring proper alignment for chambering.
- Slide Action Integration: The slide tube is directly involved in the pump action, working in conjunction with the forend to cycle the action. The 7 3/4" length significantly increases the magazine capacity compared to standard-length tubes.
7 3/4" Slide Tube: Advantages and Considerations
The 7 3/4" slide tube offers a substantial advantage: increased ammunition capacity. This is particularly valuable for home defense, hunting situations requiring multiple shots, or competitive shooting disciplines. However, there are some things to consider:
- Barrel Length Compatibility: Ensure compatibility with your barrel length. A longer tube might not function correctly or safely with a shorter barrel.
- Legal Restrictions: Check your local and state laws regarding magazine capacity. Restrictions on magazine length vary widely.
- Weight and Balance: A longer tube will naturally add weight to the front of the shotgun, affecting its balance. This might require adjustment to your shooting technique.
Common Issues and Troubleshooting
While generally reliable, the slide tube assembly can experience problems:
- Feeding Issues: Problems with the magazine spring or follower can cause feeding jams. Inspect for damage or wear.
- Tube Binding: Dirt, debris, or damage to the tube itself can lead to binding and impede the smooth operation of the pump action. Regular cleaning is crucial.
- Loose or Damaged Components: Over time, components can loosen or become damaged from wear and tear. Regular inspection and replacement of worn parts are essential for safety and reliable function.
Maintenance and Cleaning
Regular maintenance is essential to prevent problems and ensure the longevity of your slide tube assembly.
- Thorough Cleaning: Clean the tube after each use, removing any dirt, debris, or residue. A cleaning rod and appropriate solvent are recommended.
- Spring and Follower Inspection: Inspect the magazine spring and follower for damage, wear, or fatigue. Replace them if necessary.
- Lubrication: Apply a thin layer of gun oil to the moving parts of the slide tube assembly to reduce friction and prevent wear.
Conclusion
The Mossberg 500/590 7 3/4" slide tube assembly is a critical component for increasing magazine capacity and ensuring reliable shotgun operation. Understanding its function, common issues, and proper maintenance is crucial for safe and effective use of your Mossberg shotgun. Always prioritize safety and consult your owner's manual before disassembling or working on your firearm. If you are uncomfortable performing maintenance yourself, consult a qualified gunsmith.
