The Genesis Arms GEN-12 14.5" Upper Receiver 12 Gauge brings shotgun performance to a standard 308-pattern lower, giving shooters a unique blend of AR ergonomics and 12 gauge versatility. Designed around a short recoil system with no gas tube or piston, this upper is built to run smoothly on compatible DPMS GEN1 308 lowers and similar patterns, while the 14.5" barrel and extended handguard provide a balanced, controllable platform.

This upper receiver is ideal for shooters who want to expand a 308 lower into a versatile 12 gauge setup for range use, training, or practical competition. It reliably cycles 2 ¾" and 3" shells, from light birdshot to heavy magnums when paired with appropriate buffers, and accepts SGM Tactical Saiga 12 choke tubes with external threads. Genesis Arms’ attention to design and compatibility shows in the included beef up kit components that help ensure long-term reliability and confidence on the range.

• Manufacturer: Genesis Arms
• Model: GEN-12 14.5" Upper Receiver 12 Gauge
• Product Number: 100042645
• Manufacturer Number: G12U14
• Gauge: 12 Gauge
• Compatible Lowers: DPMS GEN1 308 pattern and similar
• Operating System: Short recoil, no gas tube or piston