The gauge is for use with the "No. 1 Rifle"
Can't remember which manual I got the info from but it lists SM394 as:
SM394 Inspectors, bullet head No. 1 Mk. 1 No. 1 rifle
The gauge is for use with the "No. 1 Rifle"
Can't remember which manual I got the info from but it lists SM394 as:
SM394 Inspectors, bullet head No. 1 Mk. 1 No. 1 rifle