Patriot Ordnance Factory is an American owned and operated small business specializing in AR-style rifles and pistols. POF-USA President and CEO, Frank DeSomma, an engineer with over 28 years experience in Aerospace manufacturing started this company in 2002. Due to his knowledge, POF-USA uses a short stroke gas piston, replaced the failure-prone gas rings, gas tube, and gas key, and dramatically reduced heat, friction, and fouling in the upper receiver assembly.