Christensen Arms Mesa 6.5 PRC What is this?

[mrchomponthis]

This fell out when opening the bottom metal.

 

[Keith Stone]

Looks like a primer anvil

 

[JD Jones]

Part of a primer

 

[mtnwrunner]

Looks like a primer anvil

Yup

 

[MidGAHunter]

Looks like a primer anvil to me too. Did that fall out of a brand new rifle?