The Strike Industries Rifle Thread Protector is a machined aluminum thread protector that adds a degree of customization and aesthetics to protect your crown and threads. 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.