HEADSTAMP ID on 5.56x45


#1

The headstamp reads F N B S U R P
what does the SURP stand for?
Terry.


#2

“SURP” stands for “Surpression” or in English, “over-pressure.” It is a high-pressure proof load made by Fabrique Nationale Herstal.


#3

Thanks John, gradually filling in the gaps,
Terry.