A baffle strike ruins a suppressor and sometimes the barrel with it. SureFire's 6mm alignment rod is the insurance step: with the can mounted, the rod slides down the bore and shows immediately whether the suppressor is concentric with the muzzle before a round ever goes downrange.Machined from heat treated stainless steel to tight tolerances, this rod is sized for 6mm bores. Run the check after every mount swap, adapter change, or barrel change, and any misalignment shows up as rod contact inside the can where you can see it and fix it before it costs you hardware.