We Live to Protect, so don’t leave your firearm rail unprotected. A nicked or dinged gun rail can create an inconsistent mounting surface for your optics, and the rails themselves can be sharp. So protect yourself and your gear with SENTRY's low-profile rail covers, available for M-Lok®, KeyMod, and Picatinny rail systems in a high-performance, non-slip design. They look amazing, function better than others on the market and complete your rifle’s ability to get the job done. SENTRY Keymod rail covers use the patented Wedgelok® technology to hold it securely to your hand-guard. When installing simply press each section firmly into each Keymod slot. Once the Wedgelok® is in place it will expand and lock in behind the hand-guard.