SB 5.56x45


Today I acquired a fired 5.56x45 NATO case headstamped “5.56x45 SB 85”. It is a brass case, with Berdan primer held in place with 3 stab crimps (slightly off centre). It has clear green primer annulus. Which “SB” out of the four listed on the IAA headstamp guide is this? Any info would be helpful.


Spanish, Santa Barbara.


Cheers Jon!