Stag Arms aims to give you the greatest level of capability with its components, and this Stag-15 Tactical Upper Receiver designed for AR-style pistols and NFA-regulated short-barreled rifles lives up to that promise. Chambered in 5.56 NATO, this upper receiver is sized perfectly to give you the best balance between weight and overall length while not compromising on the ballistic capabilities of the 5.56 NATO cartridge. Each Stag-15 Tactical Upper Receiver is reequipped with a 10.5-inch barrel, along with a carbine-length gas system, so you'll have unprecedented reliability with any load you choose. The low-profile gas block provides plenty of clearance for the included Stag M-LOK SL Gen 2 handguard, which offers a slim, trim platform for accessory mounting and support-hand placement. There's also an uninterrupted Picatinny rail along the top of this 9-inch handguard, which gives you plenty of room to add optics, an increased open-sight radius and other accessories. All you need to do to complete this Stag Arms Stag-15 Tactical Upper Receiver is add a bolt-carrier group and charging handle of your choice, and you're ready to rock.