Geissele SAG .375 Suppressor Alignment Gage 10-1639-F is a precision tool designed to verify the alignment of a suppressor to the bore of a firearm barrel. Manufactured from hardened steel and ground 0.002” under nominal bore diameter, this gage ensures accurate alignment and prevents wear from abrasive powder residue. The long length of the SAG aligns the gage to the bore, making it essential for maintaining suppressor performance and safety. Caliber: .375 Length: 17 inches Material: Hardened steel Ground 0.002” under nominal bore diameter Outside diameter finely finished and straight to 0.001” over its length Made in the U. S.A. Geissele SAG 6mm Suppressor Alignment Gage 10-1642-F