The Mossberg 940 Pro Tactical is a semi-automatic 12-gauge shotgun with 7+1 capacity, an 18.5-inch barrel, a 3-inch chamber, and ships with a Holosun 407K Red Dot sight included. 
 

Key Specifications 

• Brand: Mossberg 
• Model: 940 Pro Tactical 
• Caliber: 12 GA 
• Action Type: Semi-Auto 
• Chamber Size: 3" 
• Barrel Length: 18.5" 
• Capacity: 7+1 rounds 
• Weight: Approximately 7.5 lbs 
• Grip Type: Standard synthetic stock (black) 
• Sights: Fiber Optic Front; includes Holosun 407K Red Dot sight 
• Safety Type: Tang safety 
   

Detailed Features 

• Gas-Operated Action: The gas-vent system cycles the action cleanly and reduces felt recoil compared to inertia-driven designs, which is noticeable over extended shooting sessions. 
   
• Adjustable Length of Pull: Stock adjusts from 12.5" to 14.25" to fit different shooters. 
   
• Accu-Choke System: Accepts interchangeable choke tubes for versatility across different loads and applications. 
   
• Holosun HS407K Red Dot Sight: Included at purchase — speeds up target acquisition over iron sights. 
   
• Drilled and Tapped Receiver: Ready for additional optic or accessory mounts. 
   
• Barrel Clamp with M-Lok Mounting Slots: Accepts lights, lasers, or forend accessories via M-Lok interface. 
   
• Quick-Empty Magazine Release: Useful for administrative unloading or changing loads quickly. 
   

Usage 

The 940 Pro Tactical covers home defense, three-gun competition, and general range use. The 7+1 capacity is useful for defensive scenarios, and the included Holosun red dot removes the need to purchase an optic separately. The M-Lok barrel clamp gives a light-mounting option without aftermarket modifications. The tang safety is ambidextrous and easily reached. The gas system cycles a wide range of loads reliably.

The 940 Pro Tactical is well-regarded in its category, with reliability and the included optic being consistent positives.

Users most often praise reliability — the gas system cycles smoothly across different 12-gauge loads, which matters for both defensive use and competition where mixed loads might appear. The ergonomic layout, including the adjustable stock and grip, is consistently mentioned as comfortable and practical. The Holosun red dot bundled with the package is a noted advantage over competitors that sell the shotgun bare; it provides immediate aiming improvement. The optic-ready design and M-Lok barrel clamp also draw appreciation from users who like the modularity.

On the downside: weight is mentioned occasionally as running slightly heavier than some competitors. A minority of users report minor cycling issues early on that resolved with break-in shooting, which is typical for gas-operated shotguns. Some preferences around sighting systems come up as personal rather than objective complaints.