This AR-STONER AR-15 Upper Receiver provides style, function, affordability to your AR-15. Machined with M4 feed ramps, this upper features an M-Lok handguard. M-Lok Handguard slots allow mounting of popular M-Lok compatible accessories directly to precision cutouts with a sleek design that does not sacrifice strength or ergonomics. FeaturesBillet slick side stripped upper receiverColt/Glock Bolt Carrier Group, nitride finishSlim Mlok Free Float Hand GuardCharging handleDust coverLinear Compensator