8x57 is (8mm Mauser) Headspace Gauge Set GO and NO-GO

Both act like a no-go

Rifle bolt would not close on Go gauge, which it must do. Rifle bolt would not close on No Go gauge, which it must not do. Go gauge - bolt must close! No Go gauge - bolt must not close! This is the second set of gauges I bought; both sets had a faulty Go gauge.

Go gauge and No Go gauge both sat loose in my rifle and did not allow the bolt to cycle ( should cycle on Go). Might be an issue with my rifle or the gauge. Considering I tested this first on a non modified surplus rifle I seriously doubt the headspace was adjusted enough that both gauges wouldn't work. Not sure I trust this gauge based on this experience. Buy at your own risk.

2 separate rifle that close on a factory cartridge and neither will close on the go gauge

Would not close on the Go Gauge. Tested in 3 Mausers, one of which i shoot regularly, so their measurements are obviously off. Trash product

Fast ship. Exactly as described. Very economical.