The Forster Headspace Gauge is essential for measuring the chamber length of rifles to ensure safety and accuracy, especially when chambering a new barrel or purchasing a used gun.
This gauge is specifically designed for the 300 AAC Blackout cartridge and is made to SAAMI specs, with a NO-GO dimension .0005 inch under 7.62 NATO specification.
The gauges are machined steel and can be interchangeable between calibers that share the same Stock #, with various caliber compatibility listed for .30-30, .30-06, and Magnum cartridges.