HG-M1031-15 15" Rifle Length Free Float Rail System guarantees precise
fitment with your Mil Spec Standard AR M4 5.56 Nato/.223 upper receiver.
All aluminum T6 aircraft 6061 construction with level III hard anodize
finish. This accessory rail system is designed for 16"-20" barrel, long
rifle configuration. Can be implemented for SBR (short barrel rifle)
configuration in conjunction with installation of Micro Gas Block.