Beamshot RF9 Mount for Std 1911 Rail System On Bull Barrell Long Guns Black RF9-A. 1911 rail system on bull barrell long guns Specifications for Beamshot RF9 Mount: Manufacturer: Beamshot Color: Black Gun Model: 1911 Additional Features: Creates a standard 1913 rail system on your bull barrel long gun Features of Beamshot RF9 Mount: 1 Convenietly creates a standard 1913 rail system on your bull barrel long gun Ideally Suited for 12 or 16 Gauge shotguns or attach to any bull barrel with an outer diameter of 20-24mm (.79-.94) Package Contents: Beamshot RF9 Mount What firearm models does the manufacturer say Beamshot RF9 Mount is compatible with? The manufacturer suggests that Beamshot RF9 Mount is compatible with 1911Beamshot RF9_A: RF9 Mount for Std 1911 Rail System On Bull Barrell Long Guns Black