LWRC Advanced Direct Impingement Bolt Carrier Group, 6.8SPC 200-0091A03 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.