Design inspired by the XM-177 Moderator, this extended flash hider will extend a 12.5" barrel to legal non-NFA length when pin and welded. Overall Length- 4.15" (adds approximately 3.56" when pinned and welded, 1" in diameterWeight- 6.4oz5 flash hiding ports, sealed bottom similar to an A2 flash hider.125" hole pre-drilled for pin and weldHeat Treated for strength & durability Phosphate Coated for corrosion resistance Milled flats for easy installationCNC machined from bar steelFully Precision Machined in House at KAK IndustryCrush washer not included