Guys, I have a Hawken Hunter 3-9x4- scope on a 50 cal BP bbl I bought, and don't understand why they call it a BP scope. What in the world is the difference in a "BP scope" and a regular scope? I was thinking about changing it over to another bbl, but didn't want the new bbl with the BP scope on it to explode, or crack open, or whatever. Seriously, what is the difference if anyone knows. Thanks, Wallacem in Ga