This AR-STONER AR-15 Upper Receiver provides style, function, affordability to your AR-15 Pistol. The A3 upper attaches to virtually any standard AR-15 lower receiver. 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.The AR-STONER Pistol Kit also includes a pistol buffer tube assembly. The buffer tube is machined from 6061-T6 aluminum and given a hard coat anodized finish to withstand years of abuse. Included in the Pistol Kit is the AR-STONER Lower Parts Kit which includes everything needed to build a complete lower receiver, except a stripped lower receiver. All parts are made to standard military specifications. Lower Parts Kit IncludesBolt CatchBolt Catch PlungerBolt Catch Roll PinBolt Catch SpringBuffer RetainerBuffer Retainer SpringDisconnectorDisconnector SpringHammerHammer PinHammer S...