The Serbu BFG-50A is one of only a couple self-loading .50 caliber rifles manufactured in the US. Work on its design began in 2008, and the first finished examples were produced in 2011. A total of about 500 have been made to date. Mechanically, it is a direct gas impingement action with a 3-lug rotating bolt. Weighing in at 23 pounds, it is significantly lighter than its closest comparison, the Barrett M82A1.