HEXMAG's AR-15 4-Slot M-LOK Low Profile Rail Covers add a unique look to your handguard, assist with heat mitigation during prolonged strings of fire and help protect your investment. These M-LOK rail covers use a patented Wedge-Lok technology to connect them securely to your handguard. When installing, simply press each section firmly into each M-LOK slot. Once the Wedge-Lok is in place it will expand and lock in behind the handguard. Package of 4. RSR - TRUTP-P365B-XTG