Adcor currently manufactures AR piston weapons with barrel lengths ranging from 10 to 24 for both .223 and 5.56 calibers, along with receivers and rail systems for both gas impingement and piston style weapons. Piston system for cleaner more reliable operations. Free floating barrel for improved accuracy. Dust wiper to protect upper receiver and components. Removable folding front piston sight for ease of cleaning. Ambidextrous forward placed charging/forward assist handle to help maintain target acquisition. Fully integrated rail system. Adjustable cyclic rates for use with different ammunition or suppressors. Toolless maintenance system allowing components to be removed with bullet or firing pin.