Out of stock
SKU: URSSB762
UPC: 816341021969
MPN: URSSB762
The Faxon Firearms Arak-21 complete upper chambered in 7.62x39 with a 16-inch barrel gives AR-15 shooters a piston-driven way to run the Russian intermediate cartridge without a dedicated rifle build. It drops onto a standard mil-spec AR-15 lower, so a builder who already owns a lower can add hard-hitting 7.62x39 ballistics to an existing platform. This configuration suits hunters, range shooters, and anyone who wants the terminal performance of 7.62x39 in a familiar AR ergonomic package. See our full lineup of AR-15 upper receivers for additional caliber options.
This upper uses a short-stroke piston operating system rather than direct gas impingement, which keeps fouling and heat out of the receiver and bolt carrier group. The 16-inch barrel meets the federal minimum for a rifle build and balances velocity with handling for the 7.62x39 round. The design feeds from the curved magazine geometry the cartridge requires, and the free-float handguard runs M-LOK attachment points for lights, lasers, and vertical grips. Faxon Firearms machines the system around the Arak architecture, which routes the operating components above the barrel for a cleaner internal path. Builders cross-shopping calibers can compare it against the 5.56 version of this same upper.
A shooter picks this upper to run cheaper 7.62x39 surplus and bulk ammunition through an AR-pattern rifle, whether for range time, hog hunting, or general-purpose defense. The piston system tolerates dirty steel-case loads better than many gas-impingement designs, which matters when feeding budget ammunition. Pair it with a quality lower and the magazines this cartridge requires, and you have a complete 7.62x39 carbine ready for use. If you want a shorter barrel for a more compact build, the 12.5-inch 7.62x39 version covers pistol and SBR configurations.
Yes. The Faxon Firearms Arak-21 upper is built to mate with a standard mil-spec AR-15 lower receiver. A builder who already owns a compatible lower can attach this complete upper and run 7.62x39 without a separate rifle build.
It uses a short-stroke piston operating system. The piston design keeps carbon fouling and heat out of the receiver and bolt carrier group, which helps when feeding dirty steel-case 7.62x39 ammunition through the platform.
The 7.62x39 cartridge has a pronounced case taper that requires magazines with the correct curved geometry for reliable feeding. Use magazines designed specifically for 7.62x39 AR-pattern rifles rather than standard 5.56 magazines.
This is a complete upper receiver assembly built around the Arak-21 piston architecture. Confirm the included components against the product listing before pairing it with your lower so you know exactly what arrives in the box.
WARNING ⚠️ You must be 18 or older to purchase shotgun or rifle ammunition and 21 or older to purchase handgun ammunition and firearms. Please reference our requirements for ammunition orders to "restricted" states HERE. Always make sure you use the correct ammunition for your firearms. Ammo cannot be shipped to a PO Box. Please reference state & local laws before making a firearm or ammunition purchase.
