Centurion Arms OEM CMR Accessories are made of fiber-reinforced polymer that helps maintain a light weight platform while also acting as a heat shield. The polymer accessories adhere to the K.I.S.S. principal and directly mount to the CMR with threaded fasteners making them easy to install and modify to customize your rifle for your shooting needs. All CMR accessories are universal, in that the same accessories work on the 5.56/.223 rifles and the 7.62/.308 rifles hand guards. CMRaccessories are interchangeable without having to utilize back plates or dismantle the rail system itself...thus keeping the with K.I.S.S system. This allows for end users to easily customize placement of the accessories based upon other components being utilized at any given time. Standard colors for the accessories are black