The Mossberg 940 Pro is a popular semi-automatic shotgun praised for its reliability and performance. However, like any firearm, it can experience occasional malfunctions. Understanding common Mossberg 940 Pro field problems and their solutions is crucial for maintaining optimal functionality and ensuring safe operation. This guide dives deep into troubleshooting these issues, offering practical advice for both novice and experienced shooters.
Common Mossberg 940 Pro Field Problems
Several factors can contribute to malfunctions. These range from ammunition inconsistencies to user error and occasionally, manufacturing defects. Let's explore some of the most frequently reported issues:
1. Failure to Feed/Eject
This is perhaps the most common complaint among 940 Pro users. Failure to feed can manifest as the next round not chambering correctly, while failure to eject prevents spent shells from leaving the chamber. Several factors can cause this:
- Ammunition Issues: Using low-quality, dirty, or improperly sized ammunition is a leading cause. The 940 Pro is designed to function optimally with specific ammunition parameters; deviating from these can lead to malfunctions.
- Magazine Issues: A damaged or improperly loaded magazine can also prevent smooth feeding. Ensure the magazine is correctly seated and free from any obstructions. Bent or damaged followers are common culprits.
- Gas System Issues: The gas system's function is crucial for cycling the action. Dirt, debris, or malfunctioning components within the gas system can impede its operation.
- Operator Error: Incorrect handling, improper recoil management, or insufficient force during racking can sometimes contribute to feeding and ejection problems.
2. Light Primer Strikes
This problem arises when the firing pin doesn't strike the primer with enough force to ignite the cartridge. Potential causes include:
- Weak Firing Pin Spring: A weakened firing pin spring fails to deliver sufficient force.
- Dirty Firing Pin: Buildup of debris can impede the firing pin's movement.
- Ammunition Issues: Again, using ammunition that's not compatible with the firearm can lead to light primer strikes.
3. Jams
Jams can occur at various points in the cycling process. These often stem from:
- Ammunition Issues: As mentioned earlier, this is a recurring theme.
- Dirty Gun: A buildup of residue can interfere with the firearm's smooth operation.
- Damaged Parts: Worn or damaged components within the mechanism can cause jams.
Troubleshooting and Solutions
Addressing Mossberg 940 Pro field problems requires a systematic approach:
1. Clean the Gun Thoroughly
Regular cleaning is paramount. Disassemble the shotgun (following the manufacturer's instructions), and thoroughly clean all components. Pay particular attention to the gas system, bolt, and chamber. Use a suitable cleaning solvent and gun oil.
2. Inspect Ammunition
Ensure you are using high-quality, properly sized ammunition recommended for the 940 Pro. Check for dents, damage, or inconsistencies in the ammunition's construction.
3. Check the Magazine
Verify the magazine is correctly seated and free from obstructions. Inspect the magazine follower for damage or bends.
4. Inspect the Gas System
Carefully inspect the gas system for any obstructions, damage, or buildup of fouling. Clean thoroughly and lubricate as needed.
5. Examine the Firing Pin and Spring
Inspect the firing pin and its spring for wear or damage. Replace if necessary.
6. Seek Professional Help
If you've addressed the above points and the problems persist, consider consulting a qualified gunsmith. They can diagnose more complex issues and perform necessary repairs.
Preventing Mossberg 940 Pro Field Problems
Proactive maintenance is key to preventing field problems. This includes:
- Regular Cleaning: Clean your 940 Pro after each use.
- Proper Lubrication: Use appropriate gun oil to lubricate moving parts.
- Using Recommended Ammunition: Stick to ammunition specifications provided by Mossberg.
- Proper Storage: Store your firearm in a clean, dry environment.
By following these guidelines, you can significantly reduce the likelihood of experiencing Mossberg 940 Pro field problems and enjoy reliable performance from your shotgun. Remember, safety should always be your top priority. Always handle firearms responsibly and follow all applicable safety regulations.
