U-Build AR-15 7.5″ Stainless Steel 223/556 Pistol Kit This BarDef Model BD575SS-Kit is a U-Build complete AR-15 .223/5.56 pistol kit with an 7.5 inch stainless steel barrel and comes unassembled. U-Build-It! The A3 upper will attach to any standard AR-15 lower receiver and comes complete with charging handle, forward assist, ejection port cover, bolt and bolt carrier assembly. It’s tipped with an A2 flash hider. It is a great platform for a red dot or flip-up sights (sold separately). This kit also includes a pistol buffer tube assembly. The buffer tube is machined from 6061-T6 aluminum. It includes a mil-spec buffer and spring. The super durable system is tough to withstand years of use and abuse. The kit comes ready for you to assemble so you can brag that U-Built-It! This parts kit includes a complete lower parts kit (LPK). Everything needed to build a complete upper and lower, except a stripped lower receiver. All applicable parts are made to standard military specifications or better. Lower receiver not included and can be purchased separately through an FFL dealer. Kit Includes: (1) 7.5″ Stainless Steel Barrel/Pistol Gas System/Non-chrome lined (more accurate) (1) 5.56 NATO Bolt Carrier Group (BCG) (1) 7″ Slim M-Lok Free Float Hand Guard (style may vary due to availability)  (1) Lower Parts Kit w/Trigger & Hammer (1) .750 Gas Block (1) Pistol Length Gas Tube (1) Standard Receiver End Plate (1) Mil-Spec Castle Nut (1) Mil-Spec Buffer Tube (1) 3 oz. Buffer (1) Buffer Tube Spring (1) Mil-Spec Charging Handle (1) Dust Cover (1) Forward Assist (1) 1/2″-28 Thread Bird Cage A2 Muzzle Brake (1) Pistol Grip (1) Upper Receiver 5.56/.233/.300AAC, M4 Feed Ramps Comes with the Barrier Defense lifetime warranty!  ****Know your states laws when purchasing gun parts.****