Introducing the Cobalt Kinetics AR-15 Builders Set - a high-quality, precision-engineered billet upper receiver and M-Lok handguard combination that's perfect for anyone looking to build their own custom rifle.Crafted from premium 6061-T6 billet aluminum, this set is designed to deliver exceptional performance and durability in even the most challenging conditions. And with its proprietary Ambidextrous Rear Actuated Bolt Release, you'll enjoy lightning-fast reloads and improved control no matter which hand you shoot with. (Ambidextrous Rear Bolt Release Guarantees Compatibility with Cobalt Kinetics Lower Receivers)Other key features of this set include a Mil-Spec style design, standard rifle caliber compatibility, and a Picatinny rail upper section that allows for easy customization and accessory mounting.So if you're looking for a top-quality billet upper receiver and M-Lok handguard combo that's built to last, look no further than the Cobalt Kinetics AR-15 Builders Set. Order yours today and start building the custom rifle of your dreams!