Gearing up to shoot my carbines again and have some questions.....

[DaveHH]

You use the GO gauge to make sure there is ENOUGH headspace and the Field to see if the weapon has stretched or worn beyond what is safe. You want it to close on a go and NOT close on a field. The most unsafe condition in a carbine is not excessive headspace, it is too little headspace. Also remove the slide/spring and manually close the bolt on the gauge with little pressure. The Forster gauges do not require removing bolt parts.