The HEADSPACE GAUGES by FORSTER PRODUCTS, INC. are crucial for measuring chamber length to ensure safety and accuracy when chambering a new barrel or buying a used gun.
These gauges are made to SAAMI specs, with the 6MM REMINGTON GO GAUGE being .0005 inch under 7.62 NATO NO-GO specifications for safety.
FORSTER's gauges are machined steel and vary in size by caliber and gauge style, with some being interchangeable between different calibers.