First Look: The Mossberg 940 JM Pro Proves Lightning Fast In Every Way

First Look: The Mossberg 940 JM Pro Proves Lightning Fast In Every Way

Mossberg 940 JM Pro

Born to run, the Mossberg 940 JM Pro has all the assets own the shotgun stage of 3-Gun competitions.

How The 940 JM Pro Is Engineered To Be A Winner:

  • Self-cleaning piston can run for 1,500 rounds between cleanings.
  • Oversized, beveled loading port allows for fast reloads.
  • Magazine holds nine 2 3/4-inch shells.
  • Fully adjustable buttstock allows for a perfect fit.

Think race gun, a tricked out CZ Shadow or STI 2011 typically comes to mind. Seldom—outside the bounds of dyed-in-the-wool 3-Gun competitors—does the lowly shotgun end up the top thought. Though, anymore, this can be the make-or-break stage in a competition. Luckily, a company that knows shotguns has put a lot of thought into what it takes to gun for gold and looks to have turned out a winner.

Freshly unveiled, the Mossberg 940 JM Pro offers all those little extras that shave precious seconds from the clock. It figures it would. Not only does the semi-automatic 12-gauge roll off the line of one of the country’s most storied shotgun makers, but was built in conjunction with a couple of folks that know a thing or two about coming out on top in competitive shooting matches—Jerry and Lena Miculek.

So how does the collaboration shake out? Well, to say the least, with the 940 JM Pro proving a durable and intuitive smoothbore with fifth-gears engineered into every aspect.

Perhaps most important for the shotgun, a newly redesigned gas system devised to go the distance and then some. By Mossberg’s account, the 940 JM Pro will chew through some 1,500 rounds before requiring a cleaning—a plus in a pursuit that shucks shells faster than a Key West raw bar. The shotgun accomplishes this with self-cleaning piston and vented and stepped spacer tube, which all their part to keep fouling to a minimum and the gun cycling. Additionally, the piston never leaves the cylinder during operation, so no broken gas rings.

On The Mark With More Shotgun Info:

The 940 JM Pro addresses one of the most crucial aspects of 3-Gun competition, reloads. Mossberg decked out the gun with everything to juice it quickly, incorporating a large and beveled loading port, easily found and fed. This plays gateway to an ample full-length magazine that holds a whopping nine 2 ¾-inch shells, yet does not extend past the shotgun’s 24-inch barrel.

The other winner in the 940 JM Pro’s refinements is a fully adjustable stock. Thankfully, this has become a more common feature among all long guns in recent years, vastly improving their accuracy potential. With the Mossberg, it offers 1 ¼-inch of adjustment in length of pull, ½-inch in drop at comb and ¼-inch in cast. Other notables, the internal components are nickel boron-coated, it boasts a HIVIZ fiber optic front sight, it comes with a set of Briley extended chokes and its safety situated on the tang.

Perhaps the most attractive feature of the 940 JM Pro is it’s price tag, with Mossberg setting the MSRP at $1,015. Not bad, especially for a 3-gunner looking to step up their performance on the shotgun stage.

More from Mossberg:

NORTH HAVEN, CT – O.F. Mossberg & Sons, Inc., a leading American firearms manufacturer, announced today the introduction of a new 12-gauge autoloading shotgun platform; the 940 JM Pro™, available in two 10-shot models. The result of two years of development alongside world champion shooters, Jerry and Lena Miculek, the 940 JM Pro is designed to meet the needs of today’s competition shooter with the incorporation of an array of aftermarket modifications and accessories direct from the factory.

Using the iconic 930™ JM Pro-Series Competition Shotgun as a baseline, the Miculeks worked with Mossberg engineers to identify and help re-design major areas of improvement that included the gas system; loading port; point-of-aim/point-of-impact; overall product fit and functionality; sight system; and choke system.

All the newly designed components led the way for the introduction of a new autoloading platform from Mossberg, the 940. Major attributes of the 940 autoloading shotgun include:

Gas System: The new gas system on the 940 will run up to 1,500 rounds before cleaning and will reliably cycle any type of quality factory-made 2 ¾ or 3-inch ammunition. A stepped and vented-spacer component has also been incorporated that keeps the gas system running fast by shedding any moisture or carbon build-up every time it cycles.

Loading Port: The 940’s loading port has been designed to allow the user to efficiently quad-load the magazine tube straight out of the box without any need of modification to the receiver. The elevator and shell catch have also been designed to eliminate common pinch-points.

Point-of-Aim/Point-of-Impact: Mossberg engineers worked to design a new barrel-making process for the 940 that ensures the consistent production of a platform that will allow a user to maintain an accurate point-of-aim/point-of-impact when utilizing quality factory-made ammunition.

Fit and Functionality: The 940 sports a slim profile and ergonomic forend and stock, both feature Mossberg’s signature texturing that offers a positive, yet comfortable grip. The stock is completely user-configurable, offering out-of-the box adjustability for length-of-pull (13 – 14.25 inches), drop, and cast. The receiver is anodized for durability and the controls (charging handle and bolt release button) are oversized. Internal components are nickel boron-coated for smooth, reliable functionality.

Sight System: The 940 JM Pro utilizes a fiber optic HIVIZ® TriComp sight system that offers nine user-interchangeable LitePipes, in three colors and three shapes of varied height, for superior sighting in any competitive environment.

Choke System: Equipped with Mossberg’s Accu-Choke™ system, the 940 JM Pro ships with a set of Briley® extended chokes (Cylinder, Improved Cylinder and Modified) that come engraved with constriction for easy selection.

Two models of the 940 JM Pro are being initially offered; both featuring 24-inch barrel lengths; 10-round total capacity; and matte blue-finish on the barrels. Options include choice of black synthetic stock and forend (SKU #85111) with tungsten gray-anodized receiver. Gold-anodized bolt handle; bolt release button; magazine extension nut; safety button; trigger; and cocking indicator which easily identify your 940 in a rack of similarly-equipped competition guns. With the second option, the stock and forend are camouflaged with the proven Black MultiCam® pattern (SKU #85113). The receiver and controls wear a black anodized-finish. MSRP: $1015

For more information on the Mossberg 940 JM Pro, please visit


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Elwood Shelton is the Digital Editor for Gun Digest. He lives in Colorado and has provided coverage on a vast spectrum of topics for GD for more than a decade. Before that, he was an award-winning sports and outdoors reporter for a number of newspapers across the Rocky Mountains. His experience has consisted of covering the spread of chronic wasting disease into the Western Slope of Colorado to the state’s ranching for wildlife programs. His passion for shooting began at a young age, fostered on pheasant hunts with his father. Since then, he has become an accomplished handloader, long-range shooter and avid hunter—particularly mule deer and any low-down, dirty varmint that comes into his crosshairs. He is a regular contributor to Gun Digest Magazine and has contributed to various books on guns and shooting, most recently Lever-Actions: A Tribute to the All-American Rifle.


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