✅ SOLVED Finding so many of these little tubes...

[BLACKIE555]

Copper. Near an area where Memorial Day services are held. Lots of brass casings, presumably honor guard rounds. Round one one end, flattened on the other, all have a little barb. ??
Kooky?

 

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Cannon primer?

 

[Retired Sarge]

Was going to suggest the same thing.....Friction primer.

cannon friction primer - Google Search

 

[BLACKIE555]

Well that didn't take long...yes, there is a cannon lurking amidst the finds. Thanks!

 

[TheCannonballGuy]

Since nobody else has done so, I think I should mention that the cannon friction-primer in the finder's photo is a modernday imitation of the civil war version. Note, it should not be called a Reproduction because there never was a civil war one that has the same shape/form as this 20th-Century version. This type is (of course) made for use by civil war artillery Re-enactors. I used to be one, in the 1980s/90s, so I am quite familiar with this modern version. Examine the photos below to see details of its form, and some unfired/unused ones, brand-new out of the packet. (The one found by BLACKIE555 is a used one --that is why the pull-wire is absent.)