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Anyone putting together a 6.5 Grendel upper knows that headspace is one of those things you don't want to guess on. This Forster Go gage takes the guesswork out of it. It's a single, precision-ground steel reference piece that tells you whether your chamber and bolt combination has enough room to safely close on a cartridge built to industry standards. Drop it in the chamber with a stripped bolt, and if the bolt closes with light pressure, your chamber meets the minimum spec.
Headspace is the distance from the bolt face to the point in the chamber where the case shoulder stops. Get it wrong and you're looking at poor accuracy at best and a ruptured case at worst. The Go gage represents the minimum acceptable headspace. When the bolt closes on it cleanly, you know the chamber will accept factory ammunition made to SAAMI dimensions. Pair it with a No-Go gage and you've got both ends of the safe window covered, which is exactly how most gunsmiths chamber a barrel.
This is the tool for the AR builder or home armorer mixing barrels and bolts. Grendel bolts come in different face depths, and any time you pair a new barrel with a new bolt, or swap either one on an existing rifle, the headspace needs to be rechecked. Reputable barrel and bolt combos are usually fine out of the box, but plenty of folks would rather measure and know than assume. Used rifles are worth checking too, since you rarely know their history.
Forster has been machining these gages in Illinois for decades, and they've earned a reputation as one of the go-to names alongside a small handful of quality makers. Each gage is cut from steel to tight tolerances, with the caliber and gage type marked on the side so there's no mixing them up on the bench. At 1.34 inches long, it's a compact, no-nonsense piece of kit that'll last a lifetime if you don't lose it.
The Go gage checks that your chamber has at least the minimum acceptable headspace. If the bolt closes on it with light pressure, the chamber will safely accept factory ammunition made to industry standard dimensions. If the bolt won't close, the chamber is cut too short and needs attention before firing.
For a complete check, yes. The Go gage confirms the minimum, and a No-Go gage confirms the maximum. Most gunsmiths chamber a rifle so the bolt closes on the Go but not on the No-Go, which puts the headspace inside the safe window. The Go gage on its own still tells you the chamber isn't cut too shallow.
Any time you pair a new barrel with a new bolt, swap either component, or buy a used rifle with an unknown history. Grendel bolts come in different face depths, so mixing parts is exactly when a gage pays off. High round counts or extraction problems are also good reasons to recheck.
Strip the bolt of its extractor and ejector first so those parts don't create a false reading. Drop the Go gage into the chamber, then close the bolt behind it. The bolt should close and rotate with only light pressure. Always confirm the gage matches your exact caliber, since a Grendel chamber needs a Grendel gage.
| UPC | 757253991103 |
|---|---|
| Manufacturer | |
| Manufacturer Part Number | HG65GRENG |
| Color | Steel |
| Length | 1.34'' |
| Quantity | 1 |
| Shipping Weight | 0.075 |
| Style | Go Gauge |
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