Some Mossberg 940 JM Pro users report issues with cycling and occasional jamming. Others mention difficulties in initial break-in periods.
The Mossberg 940 JM Pro, a shotgun celebrated for its reliability and performance in competitive shooting, occasionally faces scrutiny from its users. Designed with input from world-renowned shooter Jerry Miculek, this model aims to offer unmatched speed and accuracy. Yet, like any firearm, it can encounter operational hitches.
These problems usually stem from the break-in period or improper maintenance. Understanding and addressing these challenges early can significantly enhance the shooting experience. This shotgun, while highly esteemed, reminds users that regular maintenance and familiarization with the firearm’s mechanics are crucial for optimal performance.
Introduction To The Mossberg 940 Jm Pro
The Mossberg 940 JM Pro stands as a leading shotgun in competitive shooting. This model boasts reliability and performance. Let’s delve into what makes the 940 JM Pro a top choice.
The Allure Of The Mossberg Brand
Mossberg resonates with gun enthusiasts worldwide. Known for durability and innovation, their firearms are trusted by many. The 940 JM Pro continues this legacy.
Initial Impressions Of The 940 Jm Pro
- Design: Sleek, user-friendly.
- Features: Enhanced loading, quick-cycling.
- Performance: Consistent, competitive edge.
Key Features Of The 940 Jm Pro
The Mossberg 940 JM Pro offers standout features for shooters. With its advanced loading system and adaptable stock, it meets the needs of competitive environments. Let’s dive into the specifics that make the 940 JM Pro a top choice.
Enhanced Loading System For Competitive Shooting
The 940 JM Pro boasts an improved loading system. This system allows for rapid, smooth shell insertion. Shooters can expect minimal interruption during competitions. The loading port, elevator, and barrel clamp promote quick and easy loading.
- Enlarged loading port for faster reloads
- Redesigned elevator prevents thumb bite
- Extended barrel clamp for stability
Customizable Stock And Controls
Custom fit is crucial in competitive shooting. The Mossberg 940 JM Pro excels with its adjustable stock and controls. Shooters can tailor the shotgun to their preference. This customization enhances performance and comfort.
| Feature | Description |
|---|---|
| Adjustable LOP | Length of pull adapts to shooter size |
| Adjustable comb | Ensures proper cheek weld |
| Adjustable controls | Optimized for user preference |
Common Issues Encountered By Users
The Mossberg 940 JM Pro is a popular shotgun among enthusiasts. Yet, users often report certain issues. Understanding these common problems helps owners address them effectively. Let’s explore the challenges some shooters may face.
Feeding And Ejection Malfunctions
Feeding and ejection issues can frustrate users. Common symptoms include:
- Failure to feed: Cartridges do not enter the chamber.
- Stovepipe jams: Spent shells get caught in the ejection port.
- Double feeds: Two shells attempt to chamber simultaneously.
Solutions involve:
- Checking ammo compatibility.
- Cleaning the feed ramp and ejection port.
- Inspecting the shell stop and extractor.
Maintenance Challenges
Regular upkeep is crucial for the 940 JM Pro’s performance. Users may face:
- Complex disassembly: For thorough cleaning.
- Reassembly issues: Parts must align perfectly.
Maintenance tips include:
- Frequent cleaning after use.
- Using the correct tools for disassembly.
- Following the manual’s guidelines.
Troubleshooting The Feeding Problems
Troubleshooting the Feeding Problems with your Mossberg 940 JM Pro can seem daunting. Yet, it’s crucial for a smooth shooting experience. Let’s dive into how to fix these issues, focusing on the magazine tube and the gun’s lifter and elevator.
Examining The Magazine Tube
First, let’s look at the magazine tube. It’s where the shells rest before loading. Dirt or damage here can cause feeding problems. Follow these steps to check it:
- Ensure the gun is unloaded.
- Remove the magazine tube’s cap.
- Take out the spring and follower.
- Look inside the tube. Use a flashlight if needed.
- Clean any dirt or debris you find. A soft cloth works well.
- Check for dents or damage. If you find any, a gunsmith should look at it.
- Reassemble the magazine tube.
Adjusting The Lifter And Elevator
Next, let’s adjust the lifter and elevator. These parts help move shells from the magazine to the chamber. If they’re not set right, the gun might not feed shells properly. Here’s how to adjust them:
- Again, make sure the gun is unloaded.
- Open the action and locate the lifter and elevator.
- Check if they move smoothly. If not, they may need oil.
- If they’re bent or damaged, a gunsmith should fix them.
- For minor adjustments, consult your gun’s manual. It will guide you.
- Test the action after making adjustments. Do it carefully.
By following these steps, you can often fix feeding problems in your Mossberg 940 JM Pro. Remember, safety first. Always make sure your gun is unloaded before you start working on it.
Resolving Ejection Issues
Resolving Ejection Issues with the Mossberg 940 JM Pro can be tricky. Yet, with the right steps, shooters can fix these problems. Let’s explore two key areas: the extractor and ejector, and the ejection springs.
Inspecting The Extractor And Ejector
These parts play a huge role in ejecting shells properly. Follow these steps:
- Unload your shotgun for safety.
- Remove the bolt to check the extractor and ejector.
- Look for any signs of wear or damage.
- Clean any dirt or debris that might block movement.
- If parts are worn, consider replacing them.
Tip: Always refer to the user manual for detailed instructions on removing and inspecting these parts.
Checking For Weak Ejection Springs
Weak springs can cause ejection failures. Here’s how to check them:
- Ensure the shotgun is unloaded.
- Access the ejection spring according to the manual.
- Test the spring’s tension by pressing it.
- Compare it to a new spring if possible.
- Replace the spring if it feels significantly weaker.
Regular maintenance helps prevent these issues. Clean and check your shotgun often. This keeps it running smoothly and reliably.
Maintenance Tips For Reliability
Mossberg’s 940 JM Pro is a top shotgun choice for competitive shooters. Yet, even the best firearms need proper care. Regular maintenance boosts reliability and performance. Let’s dive into some key tips to keep your Mossberg 940 JM Pro in peak condition.
Regular Cleaning Regimen
Regular cleaning is crucial for any firearm. It prevents malfunctions and wear. For the Mossberg 940 JM Pro, a cleaning routine after each use is best. This includes:
- Barrel cleaning: Use a bore brush and solvent.
- Chamber care: Clean the chamber with a chamber brush.
- Remove residue: Wipe down all parts with a clean cloth.
- Inspect parts: Look for signs of wear or damage.
Recommended Lubrication Points
A well-lubricated shotgun ensures smooth operation. Apply lubricant to these points:
| Part | Lubrication Point |
|---|---|
| Bolt | Bolt rails and carrier interface |
| Action Bars | Pivot points and action bar channels |
| Hammer | Hammer notch and sear |
| Magazine Tube | Followers and spring ends |
Use gun-specific oil for best results. Apply small amounts to avoid attracting dirt.
Enhancements And Aftermarket Support
Enhancements and Aftermarket Support for the Mossberg 940 JM Pro bring new levels of performance. Owners often look to upgrade their shotgun. This ensures peak operation during competitive shooting or hunting. Aftermarket support plays a vital role. It provides access to enhanced components. These improve the shotgun’s reliability and functionality.
Upgrading Components For Performance
Upgrading your Mossberg 940 JM Pro can lead to better results. Quality components are key for a smooth experience. New parts can refine your shotgun’s speed and accuracy.
- Bolt handles – Allow for faster reloading
- Extended magazine tubes – Increase capacity
- Enhanced loading ports – Improve loading efficiency
Finding The Right Aftermarket Solutions
Finding the right aftermarket solutions is essential. Trusted brands offer reliable parts. They fit perfectly with your Mossberg 940 JM Pro.
| Part | Benefit | Brand |
|---|---|---|
| Trigger Assembly | Crisp pull, fast reset | Brand X |
| Barrel | Accuracy, less recoil | Brand Y |
| Choke Tubes | Tighter patterns | Brand Z |
Choose upgrades that suit your needs. Each part adds value. They enhance your Mossberg 940 JM Pro’s performance. Always select quality parts for best results.
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Real-world Feedback From 940 Jm Pro Owners
Let’s dive into what owners of the Mossberg 940 JM Pro are saying.
Positive Experiences And Successes
Many users praise the 940 JM Pro’s performance. They note its reliability, even after hundreds of rounds. The shotgun’s speed and ease of cleaning stand out. Users often mention the comfort during use, thanks to its ergonomic design. The adjustable stock also gets thumbs up for fitting various body types.
- Reliable through heavy use
- Fast and easy to maintain
- Comfortable ergonomic design
- Adjustable stock fits all users
Addressing The Criticisms
Some owners report issues with the 940 JM Pro. Common complaints include occasional jams and difficulty in disassembly. Certain users face challenges with loading. The company responds actively, providing support and solutions. They offer maintenance tips and part replacements when necessary.
| Issue | Owner’s Experience | Company Response |
|---|---|---|
| Jams | Occasional, often fixable | Support and maintenance advice |
| Disassembly | Can be tricky for some | Guides and customer service |
| Loading | Difficult for a few users | Parts replacement if needed |
Final Thoughts On The 940 Jm Pro
The Mossberg 940 JM Pro, designed with high-performance features, raises the bar for competitive shooting. But it’s essential to weigh both the good and the bad before making a purchase. Let’s dive into the final analysis of this shotgun.
Balancing The Pros And Cons
The 940 JM Pro shines in reliability and speed. It’s packed with features that cater to both competitive shooters and hunting enthusiasts. Mossberg’s attention to detail in the gas system ensures consistent cycling of shells. This aspect is crucial for those who need a smooth and fast shot sequence. The ergonomic design, including an adjustable stock and a sleek forend, offers comfort during prolonged use. Users also appreciate the easy-to-clean nature of this shotgun, which adds to its practicality.
On the downside, some shooters have encountered issues. These include occasional jams and the need for break-in periods. Certain parts may require tightening or adjustments after extensive use. It’s important to consider these factors alongside the positive attributes.
Is The 940 Jm Pro Right For You?
Your shooting goals matter. The 940 JM Pro stands out for competitive use and high-volume shooting scenarios. Its design caters to those who prioritize speed, precision, and customization. If you are entering the realm of competitive shooting, this shotgun could be a strong ally.
For casual shooters, this model might offer more than necessary. The high-end features and price point align with serious shooting commitments. It’s vital to match your needs with the capabilities of the 940 JM Pro.
Consider your budget and use. Investing in a 940 JM Pro makes sense if it aligns with your shooting frequency and aspirations. The balance of pros and cons will guide your decision. Take the time to assess your priorities before choosing this Mossberg model.
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Frequently Asked Questions
What Causes Mossberg 940 Jm Pro Malfunctions?
Common issues with the Mossberg 940 JM Pro include cycling problems, which can stem from improper cleaning, lubrication, or ammunition inconsistencies.
How To Clean The Mossberg 940 Jm Pro?
To clean the Mossberg 940 JM Pro, disassemble the shotgun according to the manual, clean all parts with a solvent, lubricate, and reassemble.
Can The Mossberg 940 Jm Pro Handle Heavy Loads?
The Mossberg 940 JM Pro is designed to handle a variety of loads, but consistently using heavy loads may increase wear and necessitate more frequent maintenance.
What Is The Warranty On The Mossberg 940 Jm Pro?
Mossberg offers a limited 10-year warranty on the 940 JM Pro, covering defects in materials and workmanship.
Are There Any Common Fixes For 940 Jm Pro Issues?
Regular maintenance, using recommended ammunition, and replacing worn parts are common fixes that can resolve many of the issues with the Mossberg 940 JM Pro.
Conclusion
Wrapping up, the Mossberg 940 JM Pro, despite its acclaim, isn’t without flaws. Addressing common issues like maintenance complexity and cycling hiccups can enhance its reliability. For enthusiasts committed to precision and performance, overcoming these challenges is part of the experience.
Always consult a professional for intricate concerns, ensuring your shotgun operates at its peak.