Beamshot Universal Barrell Mount Black. 38 in Color: Black Finish: Hard Anodize Condition: New Length: 1.42 in Features of Beamshot Universal Barrell Mount: 1 Mounts to virtually every single barrel rifle or shotgun with a barrel size of 0.55" 1.06" (14mm 27mm) 2 Precision engineered to steady the laser with improved accuracy through repeated recoil For BEAMSHOT 1000 1001U 3000 5000 6000 6500 and GreenBeam 1000 2000 Laser Sights. Package Contents: Beamshot Universal Barrell Mount Beamshot UB1/B: Universal Barrell Mount Black