Built with the M4E1 Enhanced Upper Receiver
The M4E1 begins with our all new state-of-the-art forged upper receiver. The M4E1 upper receiver is a one-piece design combining the rail's mounting surface with the upper itself. By machining the rail's mounting surface into the upper itself we have condensed the parts needed to mount a free-floated rail to a mere 8 screws. The M4E1 rail system gives you options such as Keymod, M-LOK, and standard Picatinny, as well as lengths ranging from 7" to 15".