Mossberg's Stock Options: The 590R & 590RM Chisel Folders

Jeremiah Knupp

posted on March 28, 2026

News, Guns, New For 2026

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Mossberg 590R Chisel 01 — Images courtesy of Mossberg.

The Mossberg pump-action 500/590-series is the most widely produced shotgun of all time, used by everyone from sportsmen to police officers to U.S. Soldiers. Mossberg has not been satisfied to rest on its laurels, continuing to bring new and updated versions of the 590 to market. New for 2026, the company is adding two new models that use the innovative Chisel Machining folding stock.

New for 2026, Mossberg is adding a Chisel Machining folding stock option to its 590R pump-action shotguns.

The Chisel Machining folding stock uses a 7075 aluminum folding knuckle with a push-button locking mechanism. The stock locks in the extended position and is unlocked in the folded position. To this is attached an aluminum buffer tube-type mount compatible with M4-style stocks with eight positions of adjustment allowing for the length-of-pull to be adjusted between 12.5 and 16.5 inches. A Mossberg-designed stock with a recoil pad and two QD swivel sockets is used. The stock also allows the use of AR-15-type pistol grips and a Magpul MOE+ grip is mounted. A red-dot optic mount with an RMR footprint is incorporated into the rear of the stock where it mounts to the rear of the receiver.

The Chisel Machining stock folds and incorporates a mounting base for a red-dot optic.

Mossberg 590R, which incorporates a bilateral rotary thumb safety, was introduced last year.

Mossberg is now offering this stock on two 12-ga. models of the 590R, a design update with a bilateral rotary safety selector that was introduced last year. Their receivers have a flat dark earth (FDE) Cerakote finish with parkerized steel parts. A Pictainny optics rail is mounted on top of the receivers. Barrels use Mossberg’s Accu-Choke system and come with a cylinder bore choke installed. Triggers are flat-faced.

The 590R Chisel uses a tubular magazine.

The tube-magazine fed 590R has an enlarged and beveled loading port with an exposed follower.

The 590R Chisel has an 18.5-inch barrel with an integral heat shield, a tubular magazine with a capacity of six rounds and an enlarged and beveled loading port with exposed follower. It comes with Magpul MBUS 3 folding adjustable sights installed. Weighing 7.6 pounds, it has an overall length of 36.75 inches with the stock extended and an MSRP of $1,330.

The 590RM Chisel is a magazine-fed shotgun that it is a NFA firearm due to its barrel length.

The 590RM uses Mossberg’s detachable double-column box magazines.

The 590RM Chisel has an 11.5-inch barrel, making it fall under the provisions of the National Firearms Act (NFA). It uses Mossberg’s double-column detachable box magazines and is supplied with a 10-round unit. Weighing 7.6 pounds, it has an overall length of 30.59 inches with the stock extended and an MSRP of $1,435.

For more information, see the Mossberg website here.