early headspace gage

[RCS]

Interesting early gage with the small teat on the bolt face end like the M1 carbine gageAttachment 19129

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[RCS]

another photo of the 5.56mm gageAttachment 19130

[GUTS]

Strange, that's the exact same guage I have!

[PrivateSnafu]

Thank you for posting that photo. Never seen one that early.
Now if we can only find any pieces from the first issued set of armorers tools. Top row.