This AR-STONER Unassembled Rifle Kit features all the necessary parts to finish any caliber appropriate AR-15 lower receiver into a complete carbine. This kit does not include a front or rear sight, making it a great platform for a red dot or scope (sold separately).The AR-STONER Kit also includes a M4 mil-spec 6-position stock assembly. The buffer tube is machined from 6061-T6 aluminum and given a hard coat anodized finish to withstand years of abuse. The 6-position telescoping stock features a built-in sling swivel to mount your favorite rifle sling.Included in the Carbine 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 SpringMagazine CatchMagazine Catch Butto...