Identifying a 300 blackout head stamp.

[Olddude]

I am thinking about trading some 300 blackout brass for other brass. Most of the brass I have is Marked 300 blackout but I have several of these which I think they are but I don’t want to misrepresent what I have.
Thank you in advance!

 

[palmettomoon]

Lake City 5.56mm NATO converted to 300 B/O

 

[Olddude]

Thank you very much! I thought that was probably the case.