The Advanced Direct Impingement Bolt Carrier Group offers superior performance, increased reliability, and longer part replacement life cycles than the MIL-STD components. These gains are achieved through LWRCI's design technology paired with industry-leading machining and material technology. In testing, the LWRC International Advanced Direct Impingement Bolt Carrier Group exhibited remarkable performance, running over 10,000 rounds without stoppage or failure on a host weapon that was neither cleaned nor lubricated during the testing process. Increased Reliability Fits AR-15 Direct Impingement Advanced Combat Bolt