HUXWRX' bore alignment rods ensure proper concentricity and alignment of the suppressor and muzzle device along the bullet trajectory to prevent misalignment and strikes. It is recommended that barrel-to-suppressor alignment be verified on any build before it is first fired. Currently, HUXWRX offers bore alignment rods in three calibers: 5.56, 7.62, and .338.Specifications:Material: Carbon FiberLength: 0.003 inStraightness: 17 in / 43.2 cm