Aluminum forend for models - AR-15 e M16 - KNIGHTS ARMAMENT

The KAC URX 4 Rail is a fully modular design using the revolutionary KeyMod accessory mounting system. The 4 URX's rail is stronger and more stable than previous URX models due to its one piece construction. It is also lighter due to its integral barrel nut (IBN) attachment system. The IBN system allows the rail itself to act as the barrel nut when resting on the shotgun, completely eliminating the need for a separate steel barrel nut. KeyMod accessories can be mounted anywhere along the length of 4 URX, making it one of the most user configurable designs on the market.