The Radical Firearms 5.56 NATO Upper Receiver is a complete MIL-STD upper designed to fit any MIL-STD lower receiver, making it an ideal choice for both novice and advanced shooters. With a 16" barrel and an M-LOK rail system, this upper is perfect for a variety of shooting styles, whether you're building a custom rifle or upgrading an existing setup. The upper features a free float rail system, forged 7075 T6 aluminum construction, Type III anodizing for durability, and a nitride bolt carrier group ensuring reliable performance in the field. Its mil-spec charging handle allows for smooth operation, making it a reliable addition to your firearm arsenal.