Forster 6.5 PRC No Go Headspace Gage

The Forster 6.5 PRC No Go Headspace Gage is a precision measurement tool designed specifically for verifying chamber headspace in rifles chambered for the 6.5 Prcision Rifle Cartridge. Manufactured by Forster Products, this no-go gauge represents the standard method gunsmiths and precision handloaders use to confirm safe chamber dimensions before firing or reloading ammunition.

Headspace is the critical distance between the breech face and the cartridge base when the action is fully closed. Excessive headspace creates dangerous conditions: unsupported brass can rupture under firing pressure, allowing high-pressure gas to vent rearward toward the shooter. Beyond safety, headspace tolerance directly impacts accuracy—proper headspace ensures consistent round seating and uniform firing behavior shot after shot. The no-go gauge sets the upper limit of acceptable headspace; if the bolt closes on a no-go gauge, the chamber is oversized and requires correction. This compact tool measures 3.65 inches long and weighs just 0.12 pounds, making it portable for range work or gunsmith operations.

This gauge is essential for anyone building or maintaining 6.5 PRC precision rifles—competitive shooters, long-range hunters, and gunsmiths rely on go/no-go headspace sets to verify chamber specifications after reaming, re-chambering, or barrel installation. The 6.5 PRC cartridge, designed for modern bolt-action rifle platforms, demands precise chamber control to achieve the accuracy and velocity this cartridge is known for. Using a no-go gauge prevents costly ammunition waste and firearm damage from out-of-spec chambers. Pair this gauge with a matching go gauge for a complete headspace verification system.