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A baffle strike on a big .375 caliber can is an expensive lesson, and the frustrating part is that most of them are preventable. Suppressors are long, and even a tiny bit of runout at the barrel threads or muzzle device gets multiplied by the time you reach the end cap. Stack a couple of small tolerance deviations together and a bore that looked fine at the muzzle can be noticeably off center at the exit hole. The Geissele Suppressor Alignment Gage gives you a fast, repeatable way to check all of that before you ever pull the trigger.
The concept is simple and the execution is where Geissele earns its reputation. This 17 inch rod is ground to 0.002 inch under nominal bore diameter, which testing has shown is the sweet spot for fitting the widest range of real-world barrels, since bore diameters and straightness vary more than most people realize. The outside diameter is finely finished and straight to within 0.001 inch over the entire length. Slide it down the bore of your unloaded rifle with the can mounted, and the long bearing surface self-aligns the gage to the bore. If you see even spacing around the rod at the end cap, you pass. If it drags on a baffle or hangs up inside the can, you just found a problem on the bench instead of at the range.
Geissele hardens the SAG so it resists wear from abrasive powder residue in the bore, won't pull burrs if it contacts a misaligned baffle, and won't let grit embed in its surface. That matters on a measuring tool, because a gage that picks up wear or debris stops telling you the truth. This one keeps its precision through years of checks. It's made in the USA, and for anyone running a suppressor on a .375 CheyTac class rifle or similar large bore build, it's cheap insurance compared to repairing a can. Always confirm the bore is clear after gaging and before you shoot.
With the rifle verified unloaded and the suppressor mounted, slide the gage down the bore from the muzzle so its long bearing surface aligns to the barrel. Look at the end cap: even spacing all the way around the rod is a complete pass. If the rod touches a baffle on its way through, or gets stuck before exiting the can, the suppressor needs to be realigned before firing. Always double check the bore for obstructions after removing the gage.
Barrel bores vary more than most folks expect, both in diameter and straightness. Geissele found that 0.002 inch under nominal is the size that fits the widest range of barrels while still giving accurate results. The 17 inch length does the aligning work, so a super tight fit isn't necessary for a trustworthy reading.
Alignment problems come from several stacked sources: barrel thread runout relative to the bore, the barrel shoulder not being square to the threads, and misalignment in the muzzle device or the suppressor's own mounting geometry. Those small errors add up over the length of a long can, and your eye can't reliably catch a few thousandths of offset. The gage physically proves whether the bore centerline clears every baffle and the end cap.
The rod is hardened specifically so it holds up. It resists wear from abrasive powder residue in the bore, won't raise burrs if it brushes a misaligned baffle, and won't let grit embed in its finely finished surface. That hardening is what keeps the gage accurate check after check, since a measuring tool that wears becomes a guessing tool.
| UPC | 817953029718 |
|---|---|
| Manufacturer | |
| Manufacturer Part Number | 10-1639-F |
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