I pick up this 5.56 brass case at my local range from time to time, small font headstamp "T" and "5.56x45" at the other side, silver primer, 3 point crimp and black tart sealant. I don't recognize the headstamp, google suggests it could be Tula but Tula brass I have seen have TulAmmo headstamp. So, who makes the "T" headstamp 5.56 ammo? Cartridgecollectors.org site also suggests headstamp "T" could be made in Spain or Swiss, I don't think we have those in US.