The Diamondhead VRS-T 13.5” Free Floating Handguard offers an uninterrupted rail extension and handguard in perfect alignment with the host weapon’s flat top receiver. The VRS-T rail replaces the factory delta ring and barrel nut. Features include a comfortable triangular shape in a solid, lightweight, free float design; Mil. Spec. Type III anodized 6061 aluminum construction with a Mil. Std. 1913 rail dimension which is flush mounted to the receiver’s flat-top rail for an uninterrupted mounting surface for optics / sights. This handguard mounts on barrels with a low profile gas block (not included – see our Part # GB-LOPRO-2U). A proprietary replacement barrel nut is included that allows for easy installation and elimination of barrel nut timing issues, and provides a rigid, secure attachment to the upper receiver assembly. The VRS-T improves accuracy and provides exceptional airflow to keep barrel cooler, provides comfort and ease of shooting while allowing for personal modification with optional rail accessories (rails & bumpers) NOTE: Requires removal of both delta ring and factory barrel nut and replacement of front sight with low profile gas block. Note also that some heavy barrels may have compatibility issues with the Diamondhead VRS-T barrel nut.