Features Precision CNC machined aluminum w/ anodized finish Licensed F-1 Firearms w/ engraved logos Bull barrel profile w/ weight reducing fluting Low profile aluminum mock gas block w/ steel mock gas tube 14mm counter-clockwise thread Based in the great state of Texas, F1 Firearms has become one of the premier brands in semi-automatic sporting rifles. Utilizing premium materials and cutting edge manufacturing processes, F1 produces firearms that are lighter, stronger, more accurate and built to more demanding tolerances than their competition. F1 Firearms are designed to stand out from the crowd, with an F1 rifle, not only will you look better than the rest, youll shoot better than the rest.Thread Direction: 14mm NegativeLength: 16"Material: AluminumCompatibility: For Standard Tokyo Marui Spec M4 / M16 series Airsoft AEG riflesManufacturer: EMG