Forster No-Go Headspace Gauge Features Machined from hardened steel to withstand repeated use without losing dimensional accuracy this gauge is built for gunsmiths and serious reloaders who need consistent trustworthy results every time they check a chamber. The No-Go designation means it represents the maximum acceptable headspace measurement so a bolt that closes on this gauge signals a chamber has been cut too generously and warrants further inspection with a Field gauge. Precision manufacturing to SAAMI specifications ensures the gauge reads consistently across uses which matters when comparing measurements over time on the same rifle or across a batch of barrels. The gauge s small dense steel body is easy to store in a range bag or gunsmithing kit alongside its Go and Field counterparts. Rifle owners chambering a new barrel use the No-Go gauge as the middle checkpoint in the three-gauge headspace verification process ensuring the chamber falls within a safe working range before the rifle is ever fired. Anyone purchasing a used bolt-action rifle in 222 Remington can use this gauge to confirm the chamber has not stretched from wear before trusting it with live ammunition. Because it is caliber-specific this gauge is intended solely for 222 Remington chambers and should not be substituted for gauges of other cartridges. For gunsmiths and precision shooters at GrabAGun who take chamber safety seriously this Forster No-Go gauge is an essential piece of shop equipment. Forster 222 Remington No-Go Gauge Specifications Brand: Forster Caliber: 222 Remington Gauge Type: No-Go Material: Steel Quantity: 1 Available At: GrabAGun