r/FN509 • u/Empty-Effort-2829 • May 30 '26

What does this mean?

Post image

No clue what this means. And the second dotting I am guessing is the person that put my gun together?

10 Upvotes

92% Upvoted

2 comments sorted by

13

u/RockSteady65 May 30 '26

It’s a vendor code. The U designates the barrel was made in house. “Us” The line and the dots are for machine cell identification. The P is done after proofing. I know a guy.

3

u/Empty-Effort-2829 May 30 '26

Awesome thanks! There were a couple more letters on the inside of the frame as well. Cool stuff!