MI AR Long Picatinny Rail Forearm Mount -  Precision CNC manufactured from of 6061 aluminum and hardcoat anodized, these mount under your standard Carbine, M4, or Rifle length AR15 handguards. A very easy install; these do not require removal of your heat shields. These include rail, mounting hardware, 2 set of screws, and an allen wrench.
 
Mounting hardware included
Will fit AR series handguards with large or small holes
Hard coat anodized 6061 aluminum construction
In most circumstances you will be able to use standard heat shields after installation