.300 blackout headstamp ID

Recently acquired a .300 blackout shell and was wondering the manufacturer as well as what the symbols on the shell mean.

I believe the headstamp reads “LC 11” then two circles followed by another circle with a cross in it

Cheers Hamish

Reformed Lake City, “LC 11” 5.56x45mm case. Ring primer crimp removed, NATO + , two scamp dots.