The SureFire-approved way to verify proper suppressor alignment Precision-machined rod will show any deviation in alignment Specific rods available for most popular calibers SureFire Bore Rods are valuable tools that will ensure proper concentricity along the bullet flight path when firing suppressed on a new platform. The rod most closely represents the bullet flight path and will show any misalignment, if present. SureFire recommends that operators verify barrel-to-adapter-to-suppressor alignment on any new build or any previously unshot setup, and SureFire Bore Rods are the most effective way to confirm it. Simply choose the corresponding rod for your caliber rifle or carbine.