Geissele SAG 5.45 Suppressor Alignment Gage 10-1345-F

Geissele SAG 5.45 Suppressor Alignment Gage 10-1345-F verifies the alignment of a suppressor to the bore of a firearm barrel, catching a misalignment problem most shooters never think to check for.

This Geissele SAG 5.45 Alignment Gage works because a suppressor is usually much longer than the barrel-to-muzzle-device interface, so a small deviation at the mounting point translates into a much larger deviation at the suppressor's exit hole. Those small deviations can also compound rather than cancel out, making misalignment worse the farther down the suppressor's length it travels.

Manufactured from hardened steel and ground 0.002" under nominal bore diameter, this Suppressor Alignment Gage is finished straight to 0.001" over its full 17" length. That length is what does the actual aligning work — it doesn't need an overly tight fit to the bore, since the gage's own straightness carries the alignment check down the suppressor's full length. Geissele hardens the SAG specifically so it resists wear from abrasive powder residue and won't pull burrs if it contacts misaligned baffles inside the suppressor.

Key Features:

• 17" length, 5.45mm caliber
• Hardened steel construction
• Ground 0.002" under nominal bore diameter
• Straight to 0.001" over its entire length
• Resists wear from powder residue and baffle contact
• Identifies complete pass, partial failure, and complete failure conditions
• Black finish
• Made in the USA

This gage turns a guessing game into a verifiable check, catching suppressor misalignment on a 5.45mm platform before it becomes a baffle strike.