question about barrel marking

AR/M4 AR General Discussion
1

I was told this was an FN barrel, but it doens’t have the markings that I’ve seen on most FN barrels on this site and others.

Here’s a picture:

my question is mainly about the 3S679 MP. Obviously I know about the 5.56 NATO and the 1/7.

THanks for any help. If any other photos would help let me know what pictures to take.

2

3S679 is FN’s cage code, MP is Magnetic Particle inspected

3

My FN barrel says FN on it.

4

3S679 is FN’s cage code.

5

Thanks, that helped me alot. I was able to use my google skills to verify what you said. It seems these are really good barrels.