[blhar]

I bought a MP5 barrel that was advertised as factory. I have never seen these markings. It appears to have a cartouche at the base of the barrel and then just says HK K520. It has 16 flutes. Any ideas, confirming it is German?

Thanks

 

[bauerdb]

Yes that is German. There is the Eagle and N to the left as well. Typical German paint job.

 

[Oicani]

The K520 is the manufacture's lot number. There was a period of time where HK maintained quality control using lot numbers when production was at an all-time high for the MP5. You'll always see an "HK" proceeding the lot number.

 

[HKParts.net]

Yep, German HK for sure.