Gauge Inspectors Selected Breech Bolt No1 Rifle

[Peter Laidler]

As I understand it, the Gauge bolt was ground and then calibrated to the EXACT spec. No plus or minus.., it was exact. The hardening was also extremely hard too so DON'T use one in your rifle. If I remember correctly, the channel down the top locking cam groove was hollow, right through on the No4 gauge bolt so that the standard and the gauge could never be mistaken. Can you confirm this DRP?

We also had similar breech blocks for the BESA, Bren and Vickers plus the Vickers lock parts