Table of Contents
The Mossberg 940 JM Pro shotgun, with its semi-automatic functionality and design, has gained attention from firearm enthusiasts. However, a thread of user experiences reveals a series of common issues, predominantly centered around magazine capacity and feeding problems.
Magazine Capacity Woes
A recurring problem reported by users involves the magazine tube's limited capacity, with some stating that it only holds four shells at a time. Despite efforts to diagnose and resolve the issue, disassembling the magazine tube often reveals no obstructions. Replacement parts, including springs and followers sent by Mossberg's customer service, have proven ineffective in addressing this capacity problem.
Magazine Tube Extension Troubles
Some users suspect that the magazine tube extension might be the source of the issue. Suggestions include checking the assembly carefully and testing the follower without the spring to ensure smooth movement.
Loading Nightmares
Numerous users have faced challenges loading rounds into the magazine, especially after firing the initial rounds. Complaints include a loss of tension in the follower and difficulty seating rounds properly. Recommendations vary, with some users proposing disassembly and careful reassembly to address these loading problems.
Issues with Bolt Release and Quick-Empty Function
Reports highlight difficulties with the bolt release and the "Quick-empty magazine release" function. Users detail struggles with getting the last round to eject and an inability to pull back the charging handle, requiring disassembly to resolve the issue.
Customer Service Experiences
Several users have sought assistance from Mossberg's customer service, with mixed outcomes. While some received replacement parts, others found the problems persisting, leading to frustration among users who feel they have become unintentional "test dummies."
User-Reported Problems and DIY Solutions
Jamming Issues
Problem: The shotgun experiences occasional jams where the bolt fails to return to its starting position.
Solution:
- Thoroughly clean the chamber and the magazine tube to remove dirt or debris.
- Switch to different types of ammo with varied coatings.
- Check and replace the tension of shell elevator springs if necessary.
Feeding Problem
Problem: The shotgun encounters difficulties feeding shells into the chamber, leading to misalignments.
Solution:
- Examine the magazine tube and shell latch for signs of wear and tear.
- Replace the shell latch.
- Upgrade to a high-quality follower for smoother feeding.
Problem with the Safety Button
Problem: The safety button exhibits stickiness and hesitation during engagement or disengagement.
Solution:
- Remove and inspect the safety button for visible issues like rust or dirt.
- Upgrade to an aftermarket safety button designed for smoother and quicker action.
Cycling Issue
Problem: The shotgun hesitates to cycle smoothly, causing delays in loading new shells.
Solution:
- Thoroughly clean the gas system to ensure proper cycling speed.
- Check action bars for bends or irregularities.
- Replace the action spring for improved cycling performance.
Issue with the Ejection
Problem: The shotgun experiences ejection problems, with used shells lazily popping out or not ejecting at all.
Solution:
- Clean and lubricate the ejection area and ejector.
- Replace the ejector and its spring with new ones for smoother ejection.
Conclusion
As of November 2023, the Mossberg 940 JM Pro shotgun continues to generate concerns among users, particularly regarding magazine-related problems. While some have found temporary solutions, others express disappointment in the firearm's performance and are considering alternative options. The discussion highlights the importance of thorough testing and research before investing in a semi-automatic shotgun for various applications, including home defense and sporting activities. Users are encouraged to explore DIY solutions and carefully consider maintenance practices to address common issues with the Mossberg 940 JM Pro shotgun.
Mossberg 940 Pro Tactical vs. Benelli M4
The dominance of Italian-made semi-auto tactical shotguns, particularly Benelli's M series, has been a longstanding trend. However, Mossberg has recently entered the competition with its 940 Pro Tactical, aiming to challenge the Italian reign. This article compares the Mossberg 940 Pro Tactical and the Benelli M4, evaluating their controls, ergonomics, sights, capacity, performance at the range, and reliability.
Controls and Ergonomics
Mossberg takes advantage of over two decades of shotgun evolution by offering the 940 Pro Tactical with oversized controls, including a substantial charging handle and bolt release. In contrast, the Benelli M4 features a micro-sized bolt release, a design choice that has received criticism. The Mossberg also boasts an enlarged loading port and ejection port for faster and more intuitive reloads. The Pro Tactical's adjustable stock outshines the Benelli's collapsing stock in terms of versatility.
Sights
While both shotguns embrace the growing trend of optics, Mossberg's 940 Pro Tactical comes with a fixed high-visibility front sight, akin to a bead. In contrast, the Benelli M4 incorporates Ghost ring sights, providing a preferable option for those who favor iron sights. However, both shotguns are optics-ready, with Mossberg's optic cut receiving praise for its lower placement, facilitating easier co-witnessing with the standard front sight.
Capacity
In the capacity department, Mossberg's 940 Pro Tactical holds more rounds by default. The Benelli M4 is restricted to five rounds due to import regulations (922R), but it can potentially match the Pro Tactical's capacity with additional modifications. The ghost load feature in the Benelli gives it a slight advantage, but Mossberg's higher default capacity levels the playing field.
Performance at the Range
Both shotguns handle well and feature gas-operated systems that effectively mitigate recoil. To assess their performance, a series of timed drills were conducted, including the "Four for Four," double taps, two targets, and reloads. The Mossberg 940 Pro Tactical consistently demonstrated faster times in various drills, attributed to its lighter weight, ergonomic design, and user-friendly controls.
Reliability
In terms of reliability, both shotguns proved themselves with standard ammunition. However, the combat-proven reputation of the Benelli M4, having been deployed for over two decades in challenging environments, gives it an edge in this category.
Conclusion
The Mossberg 940 Pro Tactical emerges as a strong contender in the tactical shotgun market, offering impressive features at a more affordable price point. While the Benelli M4 holds the crown of combat shotgun king with its proven track record, the Mossberg 940 Pro Tactical excels for home defense purposes, combining functionality, ergonomics, and cost-effectiveness. Ultimately, the choice between these shotguns depends on the specific needs and preferences of the user.
