Forster‘s .300 Win Mag No-Go Headspace Gage (brand part no. BG300MN) checks the opposite end of the tolerance from the brand’s Go gauge, confirming a .300 Winchester Magnum chamber hasn’t been cut too long. If a bolt closes on a No-Go gauge, that’s a sign the chamber has excessive headspace, which can be dangerous and can hurt accuracy. This gauge measures 1.5 inches and is a standard companion tool to the Go gauge for any rifle build or inspection.

Key Specifications

• It’s built as a No-Go gauge for the .300 Win Mag chamber.
• The gauge measures 1.5 inches in length.
• It flags excessive headspace if a bolt closes on it.

Frequently Asked Questions

What does it mean if the bolt closes on a No-Go gauge? It’s a warning sign that the chamber has excessive headspace, which can be dangerous and hurt accuracy.

Is this gauge used with the Go gauge? Yes, Go and No-Go gauges are typically used together to confirm a chamber falls within safe spec.

Buy the Forster .300 Win Mag No-Go Headspace Gage

A dependable No-Go check catches excessive headspace before it becomes a safety problem. Browse our gunsmithing tools selection and order from our Lubbock, Texas gun shop for fast shipping.