Improper headspace may be dangerous to the shooter as well as an impairment to accuracy. The proper use of a Headspace Gage is the most reliable way to test the length of a rifle chamber. Forster Headspace Gages are made to exacting manufacturing standards to ensure accurate testing of your rifle's chamber.
Forster offers three lengths of headspace gages per rifle caliber. In order from the shortest to longest, they are: GO, NO-GO and FIELD: