HiViz AR Front Sight Post Black. Specifications for HiViz AR Front Sight Post: Manufacturer: HiViz Color: Black Gun Model: M4 Gun Make: AR Platform Fabric/Material: Tritium Gun Type: Rifle Features of HiViz AR Front Sight Post AR vertical tritium front sight post Fits most ar and m4 rifles with a-frame or folding sights including fixed and detachable models Includes adjustment tool and detent Does not fit magpul Package Contents: HiViz AR Front Sight Post What firearm models does the manufacturer say HiViz AR Front Sight Post is compatible with? The manufacturer suggests that HiViz AR Front Sight Post is compatible with M4HiViz ARN101: AR Front Sight Post Black