Forster Products manufactures precision headspace gauges to maximize safety and accuracy in your rifle. These gauges are necessary when finish chambering a barrel, or when checking the chamber of a used gun to be sure the headspace dimensions are within safe limits. The BG303N is the No-Go gauge variant, which corresponds to the maximum headspace recommended for gunsmiths’ chambering new bolt-action rifles and serves as a valuable tool for ensuring tight and accurate headspace.
Machined from A2 tool steel, this gauge is held to tolerances within 0.00015″ to ensure accurate testing of your rifle’s chamber. If a rifle closes on the NO-GO gage, it may still be within SAAMI specifications, or it may have excessive headspace; to determine if there is excessive headspace, the chamber should then be checked with a FIELD gage. Headspace is the distance between the face of the breech and the base of the cartridge when the action is closed, and excessive headspace can be dangerous as well as impair accuracy. Unsupported brass fired in a rifle action with excessive headspace can rupture, allowing gas to blow rearward. Forster Headspace Gages are made with painstaking care and exacting manufacturing standards to ensure accurate testing of your rifle’s chamber.
