U-Build AR-15 7.5″ 9mm Pistol Kit w/ Colt Magwell Adapter The BarDef 7.5″ pistol upper features a stout bolt carrier group and 7.5″ barrel both with phosphate finish. The A3 upper receiver will attach to any standard AR-15 lower receiver and comes complete with charging handle, forward assist and ejection port cover. The 7.5″ barrel provides incredible accuracy with a full range of ammo and cycles with no issues. The barrel is tipped with an A2 flash hider. This upper with the 7 inch hand guard (style may vary slightly due to availability) 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 heavy duty buffer and spring. The super durable components are comfortable and 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 everything needed to build a complete upper and lower, except a stripped lower receiver. All parts are made to standard military specifications or better. Kit Includes: (1) 7.5″ Barrel/Parkerized/Non-Chrome Lined (more accurate) (1) Proprietary Bolt Carrier Group  (1) Ultra Slim M-Lok Free Float Hand Guard 7″ (style may vary due to availability) (1) Standard Receiver End Plate (1) Mil-Spec Castle Nut (1) Mil-Spec Buffer Tube (1) Heavy Buffer (1) Buffer Tube Spring (1) Mil-Spec Charging Handle (1) Dust Cover (1) Forward Assist (1) Bird Cage A2 Muzzle Brake (1) Upper Receiver with Feed Ramps  (1) Complete Lower Parts Kit Included w/Trigger & Hammer (1) Stainless Steel Magwell Adapter for Colt SMG Mags Comes with the Barrier Defense lifetime warranty!  ****Know your states laws when purchasing gun parts.****