Extreme Hunter Big Bore Air Rifles. We manufacture in house 500 Nitro Express, .45, .40, and .308 rifles and a .410 shotgun. Our gun barrels are hammer-forged chrome moly steel that we purchase and the triggers are manfactured by Timney. All guns with standard laminate wood stocks are $1500. Thumbhole gunstocks are $1600. Titanium is available for custom orders. Any alterations to standard guns will raise the price of the gun. .257 is offered at custom pricing, call for price. The 500 Nitro Express base price is $1600.