Diamondhead’s innovative VRS T-KeyMod-556 Free Floating Handguards offer an uninterrupted rail extension and handguard in perfect alignment with the host weapon’s flat top receiver. The “T” rail replaces the factory delta ring and barrel nut. The VRS T-KeyMod-556 Free Floating Handguard System provides excellent flexibility of use when adding KeyMod configured accessories. Pair the VRS T-556 with the Diamondhead T-Brake (5.56mm) for optimal muzzle compensation & appearance. . Designed to give a factory installed appearance to the rifle. Proprietary replacement barrel nut included with rail that allows  for easy installation and elimination of barrel nut timing issues. Mounts on barrels with low profile gas block, or can replace  fixed front sight (using basic punch & hammer) with a low profile gas  block (not included) . Sturdy, lightweight free float design. Improves accuracy and provides exceptional airflow to  keep barrel cooler. Comfortable rounded  triangular shape . Flush mounted Picatinny top rail giving a monolithic appearance. Configured for KeyMod accessories on sides and bottom. Lightning-fast configuration changes. Uninterrupted mounting surface for optics or  other accessories. Improves comfort and ease of shooting. Customize for specific applications. Proprietary clamping system for rigid, secure attachment. Mil. Spec. Type III anodized 6061 aluminum construction. Combat durableNOTE: Requires removal of both delta ring and factory barrel nut and  replacement of fixed front sight with a low profile gas blockHEAVY BARREL COMPATIBILITY: Please note that some heavy barrels may have compatibility issues with the Diamondhead VRS barrel nut.