The SLR Rifleworks ION Lite AR-15M-LOK Handguard is designed to match up with any receiver forged or billet. The M-Lok slots and continuous top rail design of the 308H ION Lite allow plenty of room for mounting sights or accessories. Features7 Sided Design allows 45deg mounting options2 Limited Rotation QD'sNo timing of barrel nut required, no shims needed7075 Barrel nut included w/ Hardcoat AnodizeFree Floating DesignProven Slip fit locking mount design, much more secure than a clamp type mount.Billet Anti Rotation Insert (black insert included)Barrel nut uses standard wrenches or SLR Billet wrench for perfect fitContinuous top rail design allows optic mounts to cross receiver/handguard thresholdMil-Spec 1913 Mounting rails