Geissele SAG 9mm Suppressor Alignment Gage 10-451-F

Geissele SAG 9mm Suppressor Alignment Gage 10-451-F verifies that a suppressor's bore is perfectly aligned with a firearm barrel, catching a misalignment problem before it becomes a baffle strike.

This 9mm Suppressor 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 — a real concern on 9mm platforms where suppressor-to-barrel fitment tolerances can vary more than on rifle calibers.

Manufactured from hardened steel and ground 0.002" under nominal 9mm bore diameter, this Suppressor Alignment Gage stays straight to within 0.001" over its full 16" length, ensuring precise alignment without binding or sagging as it travels down the suppressor's length. Geissele hardens the SAG specifically so it resists wear from abrasive powder residue and won't pull burrs if it contacts misaligned baffles.

Key Features:

• Approximately 16" length, 9mm caliber
• Hardened steel construction
• Ground 0.002" under nominal bore diameter
• Straight to within 0.001" over its entire length
• Resists wear from powder residue and baffle contact
• Identifies suppressor or barrel misalignment before firing
• Black finish
• Made in the USA

This gage turns a guessing game into a verifiable check, catching suppressor misalignment on a 9mm platform before it becomes a safety issue.