Mossberg 940
O.F. Mossberg & Sons · Shotgun · In Production · 2020
Also known as: 940, 940 Pro, Mossberg 940 Pro
Overview
The Mossberg 940 is a gas-operated semi-automatic 12-gauge shotgun and the foundation of O.F. Mossberg & Sons' modern self-loading shotgun platform. Debuting at the 2020 SHOT Show with the competition-oriented 940 JM Pro -- developed in collaboration with champion speed shooter Jerry Miculek -- the 940 introduced a redesigned, self-regulating gas system in which the piston rides over the magazine tube rather than using the older pusher-rod arrangement of the Mossberg 930. Key internal components including the gas piston, magazine tube, hammer, and sear are nickel-boron coated, allowing the action to run up to 1,500 rounds between cleanings while a vented spacer sheds moisture and carbon during cycling. The platform chambers 2.75-inch and 3-inch 12-gauge shells, feeds from a tubular magazine, and uses Mossberg's signature tang-mounted safety. Across its variants the 940 offers an enlarged and beveled loading port, elongated elevator, oversized bolt release, extended charging handle, and a synthetic stock with adjustable length of pull plus interchangeable drop-and-cast shims. The 940 line spans competition, tactical, field, turkey, and waterfowl configurations built on this common gas-operated action.
Specifications
| Weight (empty) | 3400 g (119.9 oz) |
| Overall Length | 1245 mm (49.02") |
| Barrel Length | 711 mm (27.99") |
| Action Type | Gas Operated |
| Firing Mechanism | Hammer Fired |
| Trigger Type | Single Stage |
| Trigger Pull | 20 N (4.5 lbf) |
| Magazine Capacity | 4 rounds |
| Magazine Type | Tubular |
| Effective Range | 45 m (49 yd) |
| Barrel Rifling | Smoothbore |
| Frame Material | Aluminum |
| Barrel Material | Steel |
| Stock Material | Polymer |
| Finish | Matte Blue |
Calibers
- 12 Gauge · primary — also known as 12 ga, 12 bore
Features
- Firing modes: Semi Automatic
- Feed systems: Tubular Magazine
- Safety mechanisms: Tang Safety, Trigger Disconnect
- Features: Self Regulating Gas System, Piston Over Magazine Tube Design, Nickel Boron Coated Internals, 1500 Rounds Between Cleanings, Accu Choke System, Fiber Optic Front Sight, Drilled And Tapped Receiver, Enlarged Loading Port, Elongated Elevator, Oversized Bolt Release, Extended Charging Handle, Adjustable Length Of Pull, Adjustable Drop And Cast Shims, Sling Swivel Studs, 3 Inch Chamber
Variants
- Mossberg 940 JM Pro — Competition
- Mossberg 940 Pro Tactical — Tactical
- Mossberg 940 Pro Turkey — Hunting
- Mossberg 940 Pro Waterfowl — Hunting
Service history
Operators
- United States Civilian Market
- United States Law Enforcement (various agencies)
Production
Production years: 2020-present
The 940 platform debuted at the 2020 SHOT Show with the JM Pro competition model; field, tactical, turkey, and waterfowl variants followed. Manufactured in Eagle Pass, Texas.
Origin
Country of origin: United States
Notes
The 940 platform represents a significant evolution from the earlier Mossberg 930 and 935 models, replacing the pusher-rod gas system with a piston-and-sleeve design that rides over the magazine tube for cleaner, more reliable operation. It launched as the JM Pro competition model before Mossberg expanded the line into tactical, field, waterfowl, and turkey variants. Magazine capacity, barrel length, choke system, and sights vary by configuration; the field/sporting models typically use a 28-inch vent-rib barrel with Accu-Choke tubes, while the tactical model uses an 18.5-inch barrel. All 940 Pro models are manufactured in Eagle Pass, Texas.
Background
The Mossberg 940 was born in the competition shooting world, where Jerry Miculek -- widely regarded as the greatest speed shooter of all time -- collaborated with Mossberg to refine the gas system and controls of the 940 JM Pro. That competition-proven action became the basis for the entire 940 family, bringing 3-gun-inspired features like the enlarged loading port and extended controls to hunting, tactical, and home-defense shooters.