The R1's .308 WIN action is based on Benelli's innovative M4 military shotgun used by the United States Marine Corps. It incorporates the auto-regulating, gas-operated (ARGO) system adapted for use with centerfire rifle cartridges paired with a three-lug rotary bolt. The gas cylinder is positioned to allow for a short operating rod, resulting in less felt recoil than other rifles. Astute observers will note the R1's sleek outline somewhat resembles Benelli's legendary Super Black Eagle shotgun. The free-floating, cryogenically treated barrel is mated to a sturdy steel upper receiver to offer outstanding accuracy and a secure platform for mounting optics. The lower receiver is anodized aluminum to reduce weight. The R1's ergonomic design seamlessly blends curves and angles into a masterpiece of innovative elegance as effective and efficient as it is pleasing to the eye, a harmonious uniting of form and function. - MAGAZINE 1, CAPACITY 3+1 - RECEIVER Drilled and tapped for optics