Detailed Product Description
M4 Quad Rail
Hard-coat Anodized Finish
Rail Cover included 

AR15/M4/M16 Quad Rail Hand Guard System
Fits Variant C.A.R. Length Models
14 Slots On Each Rail
Easy To Install At Vertical Position
Precision Machined Out of Premium 6061 Aircraft Aluminum
Lightweight, Durable and Solid Fit
Round wholes design,rail cover included 12pcs/set
Easy to install