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Headspace is one of those things you don't want to guess at, and this Forster match gauge takes the guesswork out of it. Where a standard Go/No-Go set gives you a pass or fail, the match gauge line lets you read your chamber to the exact thousandth. This is the individual 1.637" size, which sits right at the upper end of the .308 range and is a popular reference point for people building on GI parts or keeping an eye on a semi-auto over time.
Think of these as a way to zero in rather than just check a box. The full match series covers every size from Go through Field in .001" steps, so by working through the gauges you can find the precise dimension your bolt closes on instead of settling for "somewhere in between." That level of detail matters when you're chasing accuracy on a match-grade barrel or trying to track how a chamber and its locking lugs are wearing after a lot of rounds downrange. If your bolt closes on this 1.637" gauge, you know exactly where you stand.
Forster machines these from A2 tool steel and holds them to tolerances within about 0.00015", so the number ground on the side is the number you're measuring against. Each gauge is precision-ground to the exact dimension listed, and Forster has been grinding gauges since 1935, so the pedigree is there. The steel construction means it's a tool that'll outlast most of the rifles you check with it.
Match shooters, armorers, and hands-on hobbyists building or maintaining .308 Win and 7.62 NATO rifles are the main crowd here. It fits the broader .308 family too, so it plays nice with related chamberings that share the same case head. If you already run a Go/No-Go set and want finer resolution, adding match gauges at the dimensions you care about is a smart move for keeping your builds honest.
A standard Go/No-Go set gives you a simple pass or fail on your chamber. The match gauge line breaks that range down into .001" steps so you can find the exact dimension your bolt closes on. This 1.637" gauge is a single specific size, which is useful when you want precise resolution rather than just a rough window.
It's ground for .308 Winchester and 7.62 NATO chambers. Because those share a case head with the rest of the .308 family, it also applies to related chamberings like .243 Win, .260 Rem, 7mm-08, and .358 Win. Always confirm your barrel's marking so you know exactly what you're checking.
It's a match gauge, so it isn't locked to a single Go, No-Go, or Field label. At 1.637" it sits toward the upper end of the .308 range, near where many builders draw the line before considering a chamber too long. It lets you measure to that exact point rather than relying on a generic classification.
Forster machines these from A2 tool steel and holds them to tolerances within roughly 0.00015". Each one is precision-ground to the exact dimension marked on the side. That means the reading you take off it is one you can trust for setting up or checking a chamber.
| UPC | 757253992254 |
|---|---|
| Manufacturer | |
| Manufacturer Part Number | HG308-1.6370-SP |
| Color | Steel |
| Length | 1.637'' |
| Quantity | 1 |
| Style | Match Gauge |
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