Guess the part ?

[Harlan (Deceased)]

No idea where it is, but it looks like it's probably from a test firing range in an arid region somewhere

It's always been a shame to me that old artifacts are used for this purpose when any type of marker would serve the same purpose. Scores of F-86's were destroyed this way even up until more recent times. The CAF B-29 'FIFI' was found on a Navy aerial test range and just hadn't been hit yet. It had been stricken from all records because it was supposed to have already been destroyed.

[RCS]

Harlan, Here is what the extractor looks like from the breech block in the Sherman tank. An
M1 clip for scale. The design is still like the old single shot rifles of the post Civil War periodAttachment 25311Attachment 25312

[Harlan (Deceased)]

That's so cool! I swear I'd pay $20 admission fee to take a tour of all your artifacts and rifles! Just getting to see your low number Springfields up close would be worth the entrance fee!