MGI, the founders of Bushmaster, have designed and produced weapons and weapons accessories which are known for increasing the effectiveness and reliability for shooters around the world. From the Rate and Recoil Reducing Buffers to the Quick Change Barrel (QCB) Upper Receiver and newest evolution in taking a proven platform such as the AR15 and making the lower receiver itself modular with interchangeable magazine wells MGI has become known for providing top quality, practical, reliable, cost effective, and innovative weapon systems to shooters around the world in many capacities and environments.