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Forster Products 30-40 Krag No-Go Gauge Headspace Gauge Steel
$37.79
$39.99
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The Forster Products 30-40 Krag No-Go Gauge is a precision headspace gauge built for gunsmiths, reloaders, and serious rifle builders who need to verify chamber dimensions on a 30-40 Krag rifle. This hardened steel gauge is machined to SAAMI specifications and serves a critical safety function: the bolt should NOT close on a No-Go gauge. If it does, your chamber has expanded beyond safe limits and the rifle shouldn't be fired. Whether you're fitting a new barrel, evaluating a used rifle before purchase, or performing routine chamber maintenance, this gauge gives you the precise feedback you need to catch headspace problems before they become safety issues.
Headspace is one of those gunsmithing fundamentals that separates careful work from dangerous guesswork. Too much headspace and you risk case ruptures, premature case head separation, and potential firearm damage. Too little, and you get extraction problems and reliability issues. A No-Go gauge is one piece of the complete picture—it tells you whether your chamber has crept into the danger zone. Forster's hardened steel construction means this gauge will hold its dimensions through years of repeated use, keeping your measurements honest every time you pull it out of your kit.
This is the right tool if you already understand headspace fundamentals and you're working specifically with 30-40 Krag chambers. Pair it with a Go gauge and a Field gauge if you want to run a complete headspace verification sequence—but this No-Go alone will catch the most critical failures. It's made for shooters and gunsmiths who don't accept mystery when it comes to chamber integrity.
Key Features
- Hardened steel construction for durability through repeated use
- Machined to SAAMI specifications for accuracy and reliability
- Designed for 30-40 Krag chambers
- No-Go configuration: bolt should not close on this gauge; if it does, chamber is unsafe
Specifications
| Caliber | 30-40 Krag |
| Gauge Type | No-Go |
| Material | Hardened Steel |
| Standard | SAAMI |
Frequently Asked Questions
What does a No-Go headspace gauge do?
A No-Go gauge checks whether your chamber has expanded beyond the maximum safe headspace limit. The bolt should NOT close on a No-Go gauge. If it does, your chamber is unsafe and the rifle should not be fired.
Who needs a headspace gauge?
Gunsmiths fitting new barrels, reloaders evaluating used rifles, and shooters performing chamber maintenance all rely on headspace gauges to verify that chambers are within safe operating limits.
Is this gauge specific to 30-40 Krag?
Yes, this Forster gauge is manufactured for 30-40 Krag chambers and should only be used on rifles chambered in that caliber.
What's the difference between Go, No-Go, and Field gauges?
A Go gauge confirms the minimum safe chamber size. A No-Go gauge checks that the chamber hasn't exceeded the maximum safe headspace. A Field gauge determines absolute maximum safe headspace; closure on a Field gauge means the rifle is unsafe. This is a No-Go gauge only.
