Apparently Extreme Big Bores is up for sale. The skinny is if someone has $250k, proper machine shop, skilled machinists, and decent business acumen perhaps you may be able to buy into a dream job at the executive level. For more info click the link below.
community.hardairmagazine.com
At least this explains why everything on their site is out of stock.

Airgun Company For Sale
Do you want to get in to the airgun business as a manufacturer? Or maybe expand existing product lines if you are already in the industry? Well this could be your chance as there’s an airgun company for sale. Extreme Big Bore Air Rifles is a division of Texas Machine Parts that has decided to...

At least this explains why everything on their site is out of stock.