UN12 Issue 25 – Now Available Nationwide!
The wait is finally over—UN12 Issue 25 is now on sale and on newsstands…
The wait is finally over—UN12 Issue 25 is now on sale and on newsstands…
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The second that Mossberg’s 590 Shockwave hit the market we knew they had a hit on their hands. The diminutive 14-inch-barreled 12-gauge shotgun has a capacity of 5+1 and measures in at just a hair over 26 inches. It’s about as compact as you can get and still dishes out quite a wallop.
The Shockwave’s “bird’s head” pistol grip is shaped to minimize felt recoil and, like other 590s, it features an ambidextrous safety, dual extractors, positive steel-to-steel lockup, twin action bars, and a smooth-operating anti-jam elevator. What else would you need in a 12-gauge? It didn’t take long for the shotgun specialists at Mesa Tactical to heed the call and zero in on just what they thought could improve on the already-impressive Shockwave. Mesa Tactical is well known for its shotgun upgrades, creating some of the most innovative add-ons for tactical, home defense, and competition uses.

The company’s latest creation is made specifically for short-length shotguns like the 590 Shockwave, as well as Remington’s TAC-13 and TAC-14. Called the Fallon Rail System, the 6061-T6 aluminum rail adds plenty of function to the solid foundation that is the Shockwave. The Fallon injects a whole lotta Mesa Tactical flavor into it by way of adding a full-length Picatinny rail along the shotgun’s spine, as well as a built-in shell carrier and M-LOK accessory mounting points on either side of the muzzle end. Let’s take a look at some of the specific details that make Mesa Tactical’s Fallon Rail System the default upgrade for short-length shotguns.
Text by John Scott and images by Josh Cast/ @fourguysguns


SureShell Carrier
Carry more ammo with the included shotshell carrier. The user can choose from either aluminum or glass-nylon-filled versions of Mesa Tactical’s legendary SureShell shotshell carrier. The carrier is available in 4- or 6-shell capacities.

Heat Shield & Strength
The curved profile of the Fallon rail features lightening holes that add not only strength but allow the rail to act as a heat shield as well.
M-LOK Mount Points
Accessorizing your shotgun has never been easier. The Fallon features M-LOK accessory mount points to support lights or lasers on either side.

Accessory Rail
The 18-inch, full-length Picatinny rail can readily accept red dot sights, lights, or lasers. The aluminum top rail is a solid base on which to mount any number of accessories.

Precision Fit
Like other Mesa Tactical rails, the Fallon Rail System is designed for a precision fit and easy installation, and it does not interfere with any of the shotgun’s controls.
Mesa Tactical Fallon Rail System
MSRP: From $174
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© 2026 UN12 Magazine
© 2026 UN12 Magazine
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