Sons of Liberty Gun Works M4 89, Semi-automatic Rifle, AR, 223 Remington/556NATO, 13.7" Pinned (16" OAL) Barrel, Mid-length Gas System, Anodized Finish, Black, NOX Muzzle Device, Vltor A5 Buffer System, Liberty Fighting Trigger, Liberty Charging Handle, Ambidextrous Safety, 30 Rounds, 3 Magazines M4-89-13.7 and a Geissele SD-E trigger installed. 

The Geissele Super Dynamic Enhanced® (SD-E®) Trigger featuring an exclusive flat trigger bow, is a finely-tuned two stage trigger providing enhanced trigger control and weapon accuracy while maintaining the robustness and reliability of our combat-proven two-stage trigger.