The Genesis Arms Gen-12 18-Inch is a semi-automatic 12 gauge shotgun built on an AR-pattern platform with a GEN1 DPMS .308-pattern lower. Genesis Arms uses a short recoil system, so the barrel reciprocates to cycle the action without a gas system to tune or foul. The free-float handguard carries M-LOK slots at 3, 6 and 9 o’clock and a full-length Picatinny top rail for optics. An Adaptive Tactical adjustable stock, a Hogue rubberized grip and a mil-spec AR trigger give it familiar handling. It ships with a 5-round magazine and a soft case.

Key Specifications

• The gauge is 12 gauge, chambered for 2-3/4-inch and 3-inch shells so it can run light loads and magnum loads alike.
• The barrel is 18.75 inches long with an external choke thread of M22x0.75, so choke tubes can be matched to the load.
• The action is semi-automatic and short recoil operated, a self-regulating system with no gas parts to tune.
• The handguard is free-float with M-LOK slots and a full-length Picatinny rail, giving plenty of room for lights and optics.
• The stock is an Adaptive Tactical adjustable stock, which lets the length of pull fit the shooter.

Frequently Asked Questions

What shells does the Gen-12 18-inch shoot? It is chambered for both 2-3/4-inch and 3-inch 12 gauge shells.

What comes with it? A 5-round magazine, a soft case and a limited warranty.

Buy the Genesis Arms Gen-12 18-Inch 12 Gauge Shotgun

The Gen-12 gives a 12 gauge the layout of an AR, with familiar controls and room for accessories on the handguard and rail. Order it from our Lubbock, Texas gun shop for fast, insured shipping to your FFL, and browse more other shotguns while you are here.