HG-M1031-15 12" 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" barrel, long
rifle configuration. Can be implemented for SBR (short barrel rifle)
configuration in conjunction with installation of Micro Gas Block.