This KAC M4 R.A.S. switches from the typical hand guards on 14.5 & 16 inch MILSPEC carbine barrels. Used to be a drop in quad rail for the AR15 System. Picatinny rails on all sides allow for various possibilities for your mounting methods. Accessories mount rapidly and simply. Quoted: The https://cashmcoyj.blogginaway.com/24099466/ras-quad-rail-things-to-know-before-you-buy