The Forster 30-40 Krag No-go Gauge is an essential tool for gunsmiths and firearm enthusiasts who demand precision and safety. Designed specifically for the 30-40 Krag cartridge this gauge ensures that your firearm's chamber is accurately sized preventing the dangerous consequences of an improperly fitted cartridge. Manufactured with meticulous attention to detail Forster's No-go Gauge is a reliable and durable solution providing peace of mind whether you're at the range or out in the field. Its straightforward design allows for easy use making it a must-have in your toolkit for maintaining optimal firearm performance.