Forster Headspace Gage FOR 22 RIMFIRE NO GO

The Forster Headspace Gage for .22 Rimfire NO GO is a precision measurement instrument designed to verify chamber dimensions and detect excessive headspace in .22 rimfire rifle actions. Proper headspace measurement is the foundation of accurate, safe gunsmithing and reloading work—a task that cannot be accomplished reliably through visual inspection or manual feel alone. This NO GO gage functions as the critical second step in the Forster headspace verification system, identifying chambers that exceed safe dimensional tolerances.

Excessive headspace creates dangerous conditions: unsupported brass can rupture under firing pressure, allowing high-pressure gases to vent rearward toward the shooter. Beyond safety, headspace directly affects accuracy and brass longevity. When a chamber measures beyond the NO GO limit, cartridge headspace increases, reducing firing pin strike consistency and accelerating case neck fatigue. The Forster .22 Rimfire NO GO gage establishes the upper boundary of acceptable chamber length, working in tandem with a GO gage to define the acceptable measurement window. Weighing just 0.03 lbs and measuring 3.5 x 0.5 x 3.5 inches, this compact tool fits easily into a gunsmith's go-bag or reloading bench setup.

This gage is essential for gunsmiths, precision rifle builders, and serious .22 rimfire enthusiasts who perform chamber work or evaluate used rifles. Custom gunsmith operations rely on Forster headspace gages as standard verification equipment during barrel fitting and chamber reaming. Ammunition reloaders developing .22 rimfire loads benefit from confirming that test firearms meet specification before proceeding with load development. Shooters purchasing vintage or surplus .22 rimfire rifles can verify chamber condition before committing to a firearm, preventing costly repairs or unsafe shooting conditions. Forster Products has maintained a reputation for dimensional accuracy in precision gunsmithing tools—a requirement where even small measurement errors compromise safety or create unreliable results.