The Geissele .408 Caliber Suppressor Alignment Gage (brand part no. 10-1640-F) is a precision fit-check gage used to confirm a suppressor mount or adapter is properly concentric with a .408-caliber bore before the suppressor is ever fired. Geissele Automatics builds this gage as a safety verification step rather than the suppressor mount itself, catching a misaligned thread or baffle stack before it becomes a baffle strike downrange on this specialized long-range chambering. This is not an NFA-regulated item; it’s a gunsmithing verification tool that any builder can own and use without special paperwork, even though it’s sometimes filed alongside suppressor parts. Stock it with the rest of our gunsmithing tools and gunsmith supplies for precision long-range suppressor-host builds.

Key Specifications

• .408 Caliber Bore Sizing Ground specifically to check alignment for this bore diameter.
• Alignment Verification Function Confirms a suppressor mount or adapter is concentric with the bore before live fire.
• Pre-Fire Safety Check Used as a build-verification step rather than a suppressor part itself.

Frequently Asked Questions

What kind of rifle typically uses a .408-caliber gage like this? Specialized long-range precision rifles chambered for .408-class cartridges, where suppressor use is common at extended distances.

Do I need an NFA transfer to buy this gage? No, this is a gunsmithing verification tool, not the suppressor itself, and requires no special paperwork to purchase or own.

Buy the Geissele .408 Caliber Suppressor Alignment Gage

A specialized long-range build deserves the same alignment check as any other suppressor host. Order this gage from our Lubbock, Texas gun shop for fast, insured shipping to your bench.