The Forster 6.5 PRC No-Go Headspace Gauge is an essential gunsmithing tool manufactured with meticulous care and strict standards to ensure precise testing of rifle chamber headspace for safety and performance.6.5 PRC No-Go Headspace Gauge (SKU: HG65PRCN)Steel construction for durability and precisionTests for excessive headspace that could compromise safetyProfessional-grade gunsmithing toolHelps prevent dangerous gas blowback from unsupported brassEvery gunsmith understands that proper headspace measurement is critical for rifle safety and accuracy. If a rifle closes on this No-Go gauge it indicates potentially excessive headspace that requires immediate attention to maintain both safety and performance standards.