Gorilla Machining New Precision Billet 4 inch M-LOK, free float installs on standard mid length AR-15 rifles and the universal M-LOK rail platform accepts all standard M-LOK accessories. The free float handguard attaches directly to the receiver, without touching the barrel or impacting barrel harmonics, thus allowing for more precise shooting. Available in black. Please note that installation of a free float handguard require gun smith tools and expertise. For questions regarding fitment or installation.