When it comes to semi-auto shotguns built for tactical use, the Benelli M4 and Mossberg 940 Tactical dominate conversations for a reason. Both are proven performers, but they go about the job very differently. One relies on a military-tested gas system that’s earned decades of respect, while the other delivers modern engineering at a price that’s easier to swallow. If you’re trying to decide which one fits your needs best, it comes down to how you shoot, what you prioritize, and how much you want to spend.
Build quality and materials
The Benelli M4 is built like a tank, using a steel receiver and high-end components designed to withstand military abuse. The Mossberg 940 Tactical takes a lighter approach with an aluminum receiver, making it easier to handle for extended sessions. While the M4 edges ahead in durability, the 940 holds its own thanks to improved coatings and solid machining. You’ll notice the difference in heft, which might matter depending on how long you plan to run the gun.
Gas system and reliability
The M4 uses Benelli’s Auto-Regulating Gas-Operated (ARGO) system, designed for consistent performance even with mixed loads and heavy fouling. It’s been trusted by the U.S. Marine Corps for years, which says plenty. The Mossberg 940 Tactical’s updated gas system is faster to clean and does a great job cycling standard defensive loads. That said, the M4 has the edge when things get filthy. If you want something that’ll keep going after hundreds of rounds without a wipe-down, the M4 has the advantage.
Ergonomics and handling
The Mossberg 940 Tactical focuses on control and comfort, offering an adjustable length-of-pull system and a slimmer fore-end that makes transitions faster. The Benelli M4 has a heavier, more planted feel that some shooters prefer for managing recoil. The difference is noticeable when moving between targets quickly. If you want a shotgun that feels nimble, the 940 wins here. But if stability and balance matter more, especially for extended strings of fire, the M4’s extra weight works in your favor.
Optics and accessory compatibility
Both shotguns are optics-ready, but the execution differs. The Mossberg 940 Tactical includes a receiver drilled and tapped from the factory and uses a versatile mounting rail. The Benelli M4’s design accommodates optics too, but some users find mounting solutions slightly more limited without aftermarket help. That said, the M4 benefits from a wide range of proven accessories thanks to its long-standing military and civilian following. If you want plug-and-play upgrades, the 940 is a bit friendlier out of the box.
Recoil management
Recoil is a big consideration with semi-auto shotguns, and here’s where design philosophies really split. The Benelli M4’s heavier build naturally soaks up more energy, making full-power buckshot loads easier to manage. The Mossberg 940 Tactical relies more on its gas system and softer buttpad to control recoil, which works surprisingly well given its lighter frame. Casual shooters will likely find the 940 easier to handle at first, but if you’re running high-volume drills, the M4’s balance and weight smooth things out better.
Maintenance and cleaning
The Mossberg 940 Tactical was designed with cleaning in mind. Its updated gas system breaks down easily, and carbon buildup doesn’t cripple performance as quickly. The Benelli M4, while legendary for reliability, does require a little more patience during disassembly and cleaning. If you’re the kind of shooter who hates spending time with a cleaning rod, the 940 wins for convenience. On the flip side, if you’re consistent with maintenance, the M4 rewards you with long-term durability and stability under extreme use.
Magazine capacity and loading
The Benelli M4 typically ships with a 5+1 capacity in civilian trims, but extensions are widely available and well-tested. The Mossberg 940 Tactical gives you a bit more flexibility out of the box, offering a 7+1 setup that appeals to defensive shooters and competitive users. Loading on the 940 is also smoother thanks to its redesigned loading port and beveled edges. If higher capacity and faster reloads matter to you, the 940 delivers a better experience without needing immediate upgrades.
Price and overall value
There’s no sugarcoating it: the Benelli M4 is expensive. It’s an elite-level shotgun designed for shooters who demand a platform proven in combat. The Mossberg 940 Tactical, meanwhile, comes in at a significantly lower price while still offering impressive performance. If your budget is tight, the 940 gives you modern engineering and great ergonomics without draining your wallet. But if you want something designed to endure decades of punishment and you’re willing to pay for it, the M4 earns its reputation.
*This article was developed with AI-powered tools and has been carefully reviewed by our editors.
