Military related? Would like to know any ideas?

[diggin jimmy hoffa]

My hunting partner and I have been hitting an area that dates back to the mid 1800's. It has military schooling affiliation, so some of the items we find do tie into being military related. Some of the coins foun in the area where these came from date between 1860's to the 1950's so there is a great span of time if that will help.

What I am wondering is about the item that I have in the photo. These are ringing up in the Nickle range and are quite abundant in this one section of the property that we have been hunting lately. Photo shows what the front and back are and the composition of the material appears to be copper.
Any help would be greatly appreciated.
Thanks
DJH

 

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Friction primer.

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[diggin jimmy hoffa]

Friction primer.

Thanks for the link PBK

DJH