Advice needed ... bolt opens on firing!

[Dad]

Bruce,
Question, I have this tool and I thought that the .04 and .042 were to measure the min and max striker protrusion!
What does the tool measure?
Is the rounded recess to the right of the .042 used to check the striker profile or what?
Any info you have will be greatly appreciated!

D.

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[ssj]

Bruce,
Question, I have this tool 8><---

Does it have any other part numbers on the other side? Ive never seen this before or any pics....interesting...Nagant's have such a tool but simpler. Is it an armourer's tool? or third party?

40 to 50thou is the protrusion spec for a no4 anyway, though 38 to 56thou seem OK...my no4s all vary a bit....

regards

[Bruce_in_Oz]

Good question.

By the designation on the tool itself, it looks fairly early.

I have a lot of weird and wonderful stuff in my toybox, but I don't actually have a genuine SMLE "multi-tool"; all I can go from is the data in the original manuals and use my new headspace gauges along with digital calipers or micrometers etc. as suitable. Bear in mind that ALL metrology equipment for "serious" use is supposed to be re-certified at regular intervals; gauges, despite being fairly tough, can actually wear. Rust is an absolute killer.

Maybe I should start a new collecting line!