The Genesis Arms Gen-12 10.5" Upper Receiver 12 Gauge transforms a compatible DPMS Gen1 .308 lower into a compact, magazine-fed 12-gauge platform. Using a short recoil system instead of a gas tube or piston, this upper is engineered to cycle a wide range of loads while maintaining smooth operation and a familiar AR-style layout. The extended top rail and ventilated handguard provide ample space for optics and accessories, while the included magazine supports fast reloads and efficient range sessions.

Designed specifically for 2 ¾" and 3" 12-gauge shells, the Gen-12 10.5" upper is well suited for range use, training, and hunting setups where a shorter, quick-handling configuration is preferred. Shooters can tune the cyclic behavior through buffer and spring choices to match their preferred ammunition, creating a tailored shooting experience. This upper showcases Genesis Arms’ focus on thoughtful engineering and practical innovation in AR-pattern shotgun systems.

• Manufacturer: Genesis Arms
• Model: Gen-12 10.5" Upper Receiver 12 Gauge
• Gauge: 12
• Action: Semi-automatic short recoil upper (requires compatible DPMS Gen1 .308 lower)
• Barrel Length: 10.5"
• Compatible Ammunition: 2 ¾" and 3" 12-gauge shells
• Included Accessories: Detachable magazine