The Benelli M4 is a 12-gauge semi-automatic tactical shotgun with an 18.5-inch barrel, 5+1 capacity, and ghost ring sights. It has a 3-inch chamber and ships with a Picatinny rail installed on the receiver. 
 

Key Specifications 

• Brand: Benelli 
• Model Name: M4 
• Gauge: 12 GA 
• Chamber Size: 3" 
• Action: Semi-Automatic 
• Capacity: 5+1 Rounds 
• Barrel Length: 18.5" 
• Overall Length: 40" 
• Weight: 7.8 lbs. 
• Sights: Ghost Ring; receiver drilled/tapped for scope mount with included Picatinny rail 
• Stock Material: Synthetic 
• Grip Material: Polymer 
• Trigger Type: Standard 
• Safety Mechanism: Crossbolt Safety 
• Finish Color: Black 
   

Detailed Features 

Benelli's Auto Regulating Gas Operated (ARGO) system uses two gas ports in the barrel to cycle the action, which handles a wide range of ammunition from light target loads to heavy buckshot without manual adjustment. The system is self-cleaning during firing. 
 
The ghost ring rear sight with a protected front post allows fast target acquisition at close to medium range. The included Picatinny rail enables mounting of optics or red dots. The synthetic stock and polymer grip hold up to weather and rough handling without absorbing moisture or swelling. 
 
At 7.8 lbs the M4 is on the heavier end for an 18.5-inch tactical shotgun, but that weight contributes to stability and reduced felt recoil. The crossbolt safety is ambidextrous. 
 

Target Audience 

Law enforcement and military users who need a reliable semi-auto shotgun that cycles a wide variety of loads, home defense users who want a proven platform, and competition shooters in 3-gun or practical shotgun disciplines. 
 

Usage Scenarios 

• Tactical and law enforcement: the ARGO system's reliability with varied ammunition makes it a trusted platform for professional use. 
• Home defense: 5+1 capacity of 12-gauge buckshot handles most defensive situations. 
• 3-gun competition: the semi-auto action and ghost ring sights support fast target engagement.

The Benelli M4 consistently receives strong reviews across law enforcement, competition, and home defense communities. Reliability is the most common theme -- the ARGO gas system handles a wide variety of ammunition types without manual adjustment, and owners report very low malfunction rates over thousands of rounds.

Build quality gets consistent praise. The M4 is used by military and law enforcement units globally, and that background is frequently cited by civilian buyers as a reason for their confidence in the platform. The materials and construction feel solid compared to most other tactical shotguns at comparable or lower price points.

The semi-auto action and ghost ring sights support fast target transitions, which 3-gun competitors mention regularly as the primary reason they chose the M4 over pump-action alternatives.

Weight comes up periodically. At 7.8 lbs it is heavier than some competitors, though most users accept the trade-off for the stability it provides during rapid firing. Extended patrol or patrol carry positions can become tiring over time.

Price is the main friction point. The M4 sits at the premium end of the tactical shotgun market, and some buyers conclude that a less expensive semi-auto from Mossberg or Beretta will serve similar purposes. Owners who chose the M4 generally feel the long-term reliability record justifies the cost.