The Troy M-LOK Aluminum Handguards have a Free Float design that provides a stable mounting platform for M-LOK accessories. The top of the handguard has a Picatinny rail that runs from the upper receiver to the end of the handguard. The other 7 sides of the handguard have M-LOK mounting slots along the handguard. Made from aircraft aluminum and stainless steel components with a Mil-Spec hardcoat anodized finish. Easy to install and mount accessories. Uses the standard AR15/M16 barrel nut which IS NOT included.