Forster 6.5 Grendel No Go Length Head Space Gage

The Forster 6.5 Grendel No-Go headspace gauge is a precision gunsmithing tool built to verify that your rifle chamber doesn't exceed safe maximum headspace limits. Whether you're chambering a new barrel, inspecting a used rifle before purchase, or maintaining your own firearms, this gauge is essential for confirming your chamber stays within SAAMI specifications. A properly sized chamber prevents dangerous malfunctions—case ruptures, misfires, and accelerated wear—that can turn a safe rifle into a liability.

This No-Go gauge works in tandem with a Go gauge to give you the full picture of chamber dimensions. While a Go gauge confirms the chamber will safely fire ammunition, the No-Go tells you the chamber hasn't grown too large. The bolt should not close on this gauge; if it does, your chamber has exceeded safe limits and the rifle should not be fired. For shooters who handload or manage multiple firearms, owning the appropriate No-Go gauge for each caliber is a smart investment in safety.

Forster manufactures these gauges from hardened steel to withstand the repeated use that comes with serious gunsmithing work. Built to exacting SAAMI standards, they deliver the accuracy and durability you need to make confident decisions about chamber integrity. If you're serious about rifle maintenance, barrel work, or vetting used firearms, a No-Go headspace gauge belongs in your toolkit.

Key Features

• Hardened steel construction for durability and accuracy over repeated use
• Manufactured to SAAMI specifications for reliable chamber measurement
• Caliber-specific design: 6.5 Grendel
• No-Go configuration prevents bolt closure on out-of-spec chambers
• Essential for barrel fitting, firearm inspection, and maintenance work

Specifications

Frequently Asked Questions

What's the difference between Go and No-Go headspace gauges?

A Go gauge confirms the chamber is large enough to safely chamber and fire a cartridge. A No-Go gauge verifies the chamber hasn't grown larger than SAAMI maximum limits. Used together, they bracket safe chamber dimensions. The bolt should close on Go but not on No-Go.

When do I need a No-Go headspace gauge?

Use a No-Go gauge when fitting or inspecting a rifle chamber, particularly when chambering a new barrel, buying a used rifle, or performing routine maintenance. It's an essential verification tool for any gunsmith or serious reloader.

Is this gauge caliber-specific?

Yes, this gauge is designed specifically for 6.5 Grendel chambers. Headspace dimensions vary by cartridge, so you'll need the correct caliber gauge for accurate measurement.

What happens if the bolt closes on a No-Go gauge?

If the bolt closes on a No-Go gauge, the chamber exceeds SAAMI maximum headspace and the rifle should not be fired until the chamber is corrected or the barrel is replaced.