300P10H50B8R

I don’t have a full product description to work from—only the short specs you’ve listed.

Based strictly on what you’ve provided, here’s the excerpt:

Diamondback DB Barrel in 300 Blackout features a 10″ pistol-length design with black nitride finish on 4150 chrome moly vanadium steel construction.

(If you have additional source material with more details about this barrel’s primary selling point or features, please share it and I’ll refine this further.)