AR Uppers
Build a rifle that runs exactly the way you like with GrabAGun’s wide selection of AR uppers. Whether you’re setting up a fast-handling home defense carbine or a longer-range SPR-style rig, you’ll find AR-15 upper receivers in popular calibers like 5.56 NATO, .300 Blackout, 6.5 Grendel, and straight-walled .350 Legend. Choose from compact pistol and SBR-length barrels all the way up to 18-20-inch precision profiles so you can dial in the balance, recoil feel, and velocity that match your shooting style.
AR-15 Upper Receivers in Popular Calibers & Lengths
From classic direct-impingement setups to smooth-running piston AR uppers, GrabAGun makes it easy to configure the gas system and features you prefer. Free-float handguards with modern M-LOK rails, slim-profile designs, and traditional Picatinny quad rails are ready for lights, lasers, and backup iron sights. You’ll find both complete AR uppers with bolt carrier groups and charging handles installed for simple “pin on and go” builds, as well as stripped AR-15 uppers for builders who want to choose every component and finish themselves.
GrabAGun’s low everyday prices, large in-stock selection, and dependable customer service make outfitting your rifle with the right AR upper a straightforward and budget-conscious process. From your first build to your next specialized upper, firearm owners across the country trust GrabAGun as a go-to source for value, variety, and no-nonsense deals on the parts that keep their ARs running strong.
