The JTS M12AR is a 12 Gauge AR-platform semi-auto shotgun (JTS part no. M12AR-GREY) built for shooters who want AR-15 ergonomics in a shotgun chassis. A 4-position adjustable gas system drives a chrome-lined 4140 steel barrel, and the gun feeds from detachable box magazines rather than a traditional tube — it ships with two 5-round magazines to get you started. An aluminum M-LOK forearm and a top Picatinny rail make it simple to mount a light, sling, or red dot, while removable front and rear sights offer a backup option if you run optics. Finished in gray, this M12AR is built as a serious home-defense and range gun.

Key Specifications

• Chambered in 12 Gauge, built around a shotgun-specific AR-style platform.
• Accepts shells up to 3 inches for a wide range of defensive and hunting loads.
• Runs a 4-position adjustable gas system to fine-tune cycling to different loads.
• Wears an 18.7-inch chrome-lined 4140 steel barrel for durability and easy cleaning.
• Holds 5+1 shells fed from detachable box magazines rather than a fixed tube.
• Ships with two 5-round magazines to get you started right out of the box.
• Features an aluminum M-LOK forearm for mounting lights, lasers, or a foregrip.
• Includes a top Picatinny rail for mounting a red dot or other optic.
• Comes with removable front and rear sights for a backup option if you run optics.
• Accepts Rem-Choke pattern tubes for tailoring shot patterns.

Frequently Asked Questions

Does the M12AR use a detachable magazine? Yes, it feeds from detachable box magazines and ships with two 5-round magazines.

Can an optic be mounted? Yes, a top Picatinny rail is included for mounting a red dot or other optic.

What choke tubes does it accept? Rem-Choke pattern tubes.

Buy the JTS M12AR 12 Gauge AR-Platform Shotgun

Shooters who want the controls and ergonomics of an AR-15 in a 12 gauge platform will feel right at home behind the M12AR. JTS built this gun around a detachable-magazine system and a full-length top rail, making it a natural fit for a home-defense build with a red dot on top. Browse our full selection of semi-auto shotguns and order the M12AR from our Lubbock, Texas gun shop for fast, insured shipping to your local FFL.