Strike Industries Barrel Cover Thread Protector 1/2x28 Blue One Size. Whether you are still deciding on a muzzle device for your AR (5.56/.223) want to evaluate the accuracy without interference from a muzzle device protect your muzzle while in transport or to pin and weld in states that restrict the use of muzzle devices the SI Barrel Thread Protector performs a valuable function without sacrificing the looks. Specifications for Strike Industries Barrel Cover Thread Protector 1/2x28: Manufacturer: Strike Industries Threads per Inch: 1/2x28 Condition: New Fabric/Material: 6061-T6 Quantity: 1 Features of Strike Industries Barrel Cover Thread Protector 1/2x28 Machined from billet 6061T6 Al Can be used with live fire (5.56/.223) Faceted design for ease of installation. Package Contents: Strike Industries Barrel Cover Thread Protector 1/2x28 1x Thread Protector Strike Industries SI-BCTP-BLU: Barrel Cover Thread Protector 1/2x28 Blue One Size