What is this? Firing pin?

[rykroll]

Found this in the water of the Chesapeake bay I find them all the time looks to be copper or brass.

 

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[nhbenz]

Copper rivets

 

[Bruce R]

A rivet.

 

[Charlie P. (NY)]

Yep. Small boat rivet.

 

[BosnMate]

Copper rivet and burr. The washer on the end is called the "burr." Used a lot in leather work.

 

[A2coins]

Are there frogs in tis thread rivet rivet rivet LOL