Please clarify your request. "6br lenfgth barel 300 meters" is not a clear or understandable phrase. I need more information to understand what you're asking about. Are you referring to:
- A barrel's length? If so, what kind of barrel? (Oil barrel, gun barrel, etc.) The length of a barrel is highly variable depending on its purpose.
- A specific type of measurement? "6br" might be an abbreviation I'm unfamiliar with.
- A typographical error? Could you please double-check and rephrase your question?
Once you provide more context, I can help you find the information you're looking for.
