Headspace Gauge 308 / 7.62 Auto Match 1.633

Forster marks this gauge as 308 since it is in the 308 family. But it is custom sized and only marked with the size. It is not marked GO since it is not SAAMI sized GO specs. No instructions, since this is custom sized for setting headspace during barrel installation with a pull thru reamer. Chamber should be reamed until the bolt just closes on this gauge and no farther. For use only on Semi autos that are safe to fire 7.62 NATO. This gauge is recommended for 7.62 match Chambers in which you need better accuracy than the too long 7.62 NATO GO spec, but not as tight as 308 SAAMI GO specs for increased reliability. This size is recommended for setting headspace on M1A match chambers, providing increased accuracy, with more safety in preventing slam fires which can happen with too tight headspace. Please consult a certified gunsmith if you are not sure if this is the correct gage for your application.