Command Arms Handguard & Rail System for AR15/M16 Carbines

The Command Arms M4S1 also works with standard direct gas operating systems which includes two interchangeable lower rails of 4" & 1.75" lengths this allows the operator to quickly change rails based on mission needs. The M4S1 also Includes 2 mounting points for a pushbutton quick detach sling swivel. It includes a bottom rail that can be mounted to the existing sling swivel mount for additional rigidity.