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A baffle strike is one of the priciest mistakes you can make with a can, and most of them are preventable with a thirty second check. That is the whole point of the Geissele 5.45mm Suppressor Alignment Gage. Drop it down the bore of an unloaded rifle with the suppressor mounted, and you can see right away whether the exit hole is centered or creeping toward a baffle. Here is the thing a lot of folks miss: a suppressor hangs way out past the threads and shoulder it mounts on, so a tiny error at that interface multiplies into a much bigger offset by the time you reach the end cap. Those small errors can stack too, since the barrel threads, muzzle device, and mount geometry each add their own bit of runout.
This is not a piece of cheap drill rod. Geissele grinds the gage from hardened steel to 0.002 inch under nominal bore diameter, which testing showed is the sweet spot for fitting the widest range of real-world 5.45 barrels while still reading true. The outside diameter is finely finished and held straight to within 0.001 inch over its full 17 inch length. That length matters, because the long bearing surface is what aligns the rod to the bore, so you get a trustworthy reading without needing a super tight fit.
The heat treatment is more than a durability flex. A hardened surface resists wear from abrasive powder residue, will not pick up burrs if it brushes a misaligned baffle, and will not let grit embed in the gage itself. In plain terms, the tool stays accurate check after check instead of slowly turning into a liar. It is made in the USA, like the rest of Geissele's tooling.
Check alignment any time you mount a new can, swap muzzle devices, or set up a fresh barrel. Always verify the firearm is unloaded first, and after the check, confirm the bore is clear before you shoot. It is a simple habit that protects a tax-stamped investment.
With the firearm verified unloaded and the suppressor mounted, slide the gage down the bore from the chamber end until it passes through the suppressor's exit hole. Look at where the rod sits relative to the end cap opening and each baffle. If the rod is centered, you're good to shoot; if it's visibly off to one side or contacts a baffle, pull the can and sort out the mounting issue first. Always confirm the bore is clear afterward before firing.
Barrel bores vary in both diameter and straightness from one manufacturer to the next, and 0.002 inch under nominal turned out to be the size that fits the most barrels while still reading accurately. The 17 inch length does the aligning, since all that bearing surface indexes the rod to the bore. A tighter fit isn't necessary and would just mean some barrels couldn't accept the gage.
No, this one is sized specifically for 5.45mm bores, which run slightly smaller than 5.56. Geissele makes a dedicated 5.56mm SAG for .223 and 5.56 barrels, along with versions in 6mm, 6.5mm, 7.62mm, 9mm, .375, .408, and .50. Match the gage to your bore diameter for an accurate reading.
Any time something in the mounting chain changes: a new suppressor, a different muzzle device, a fresh barrel, or moving a can between hosts. It's also smart to spot check periodically, since carbon buildup or a mount that's worked loose can shift alignment over time. The check takes well under a minute and can save you a wrecked baffle stack.
| UPC | 810081130929 |
|---|---|
| Manufacturer | |
| Manufacturer Part Number | 10-1345-F |
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