Geissele SAG 9mm Suppressor Alignment Gage 10-451-F is a precision-engineered tool crafted to verify that a suppressor’s bore is perfectly aligned with your firearm barrel, preventing potential baffle strikes and improving performance and safety. Manufactured from hardened steel and ground to 0.002? under nominal 9mm bore diameter, the rod remains straight to within 0.001? over its full length—ensuring precise alignment without binding or sagging. Caliber: 9mm Length: approximately 16? Material: hardened steel, ground 0.002? under nominal bore diameter Straightness tolerance: within ±0.001? over full length Made in the USA Purpose: alignment check—identify suppressor or barrel misalignment before firing Geissele SAG 9mm Suppressor Alignment Gage 10-451-F