The Magnum Research BFR is a family of heavy duty five-shot revolvers chambered in a wide variety of calibers. These all stainless steel revolvers are available with a standard sized cylinder or a longer version with rifled barrels ranging from 5.5 up to 10 in length. Factory black fixed front sights and adjustable rear sights adorn the BFRs barrel. Details Specifications and Features - Calibers .500 SW Magnum - Barrel 7.5 - Twist Rate 15 - Groove Diameter 0.500 - Overall Length 15 - Weight 4.5 lbs. - Height 6 - Slide Width 1.75 - Trigger Pull 3-4 lbs. - Finish Brushed Stainless Steel Construction - Sights Factory Black Fixed Front Rear Adjustable - Shots 5