U-Build AR-15 5.5″ 9mm Pistol Kit w/ Colt Magwell Adapter *This upper accommodates 9mm Glock and Colt SMG Mags.* BarDef Model BD9-5.5-Kit+MW is a 5.5″ barreled U-Build kit including (1) magwell adapter for Colt SMG magazines. This upper will match up with any brand mil-spec 5.56, multi-cal or proprietary 9mm lower receiver. The Colt SMG magazine will function perfectly with any AR15 mil-spec lower. For Glock mags you will need a proprietary lower or Glock magwell adapter. The mil-spec upper receiver will attach to any standard AR-15 lower receiver. The BarDef 5.5″ pistol upper features a stout bolt carrier group and 5.5″ barrel both with phosphate finish. All parts are included to complete this build are listed below except the lower receiver which requires an FFL dealer to purchase. This upper is a great platform for a red dot or flip-up sights (sold separately). This kit when complete 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 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) 5.5″ Barrel/Parkerized/Non-Chrome Lined (more accurate) (1) Proprietary Bolt Carrier Group  (1) Ultra Slim 4″ M-Lok Free Float Hand Guard (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.****