Faxon ARAK-21 XRS

The ARAK-21 was designed as a drop-on upper receiver assembly for AR-15 type rifle platforms and is offered in 5.56mm or .300 blackout chambering. The ARAK-21 contains its own internal recoil spring so the AR-15 platform's recoil spring and buffer assembly are not utilized. Semi-auto, Gas Piston operated, rotating bolt (low-recoil long stroke operating system). Manufactured of 7075-T6 Billet Aluminum. Fully compatible with all AR-15 lower receiver parts kits. Set-screw retained take-down pin spring for easy assembly. Enlarged, integrated trigger guard. Guarded, guided magazine release compatible with Norgon Ambi options. ARAK-21 XRS Lower Receivers are not appropriate for standard AR-15s. The flared cuts and squared hoop will not allow standard manipulation with standard AR-15 uppers. The ARAK XRS lower does not include a buffer retaining pin. The upper receiver is fully machined from an aircraft grade 6061-T6 aluminum billet in a one piece design that incorporates a full length picatinny rail (Mil-STD-1913) on the top and three additional rails on the muzzle end of the receiver, making it a full M4 style quad rail upper. The top picatinny rail is laser engraved for optic placement. There are also half length picatinny rails available. 12 1” length BAU is available in 5.56, heavy profile. 16” and 20” length BAU’s are available in both the 5.56 and 300 BLK. There are two profiles to choose from, medium and heavy. BAU’s can be interchanged in less than 3 minutes by removing the (6) captive allen screws on the bottom rail using the enclosed allen wrench. Long stroke variable setting gas piston system. There are three options for gas flow, and one for no gas flow.This allows forsingle shot operation. There is also a clean out port for the gas block between the gas cylinder, and the barrel. Charging handle is ambidextrous, non-reciprocating, foldable, spring returned and is easily relocated from left to right side without tools by the operator. Model “39” Eight (8) lug bolt design with involute profile for both right and left hand versions. The extractor ispositioned at 3 o’clock. This allows for a left hand version to use the same bolt by simply removing the cam pin and rotating 180 degrees and reinstalling the cam pin. Self-contained firing pin retention system enclosed in a rectangular bolt carrier that no longer requires a cotter pin. Bolted in hardened steel rail system for the bolt carrier to ride on. This allows a metal on metal wear surface forbetter wear characteristics and a much smoother operation. The ARAK-21 system allows for a folding stock to be added, as our recoil system does not extend beyond the upper receiverto fully operate. This eliminates the noise and feel of the buffer tube cycling back and forth.