ARAK-21 Faxon Upper Receiver
ARAK-21 Faxon Upper Receiver
ARAK-21 Faxon Upper Receiver
ARAK-21 Faxon Upper Receiver
ARAK-21 Faxon Upper Receiver
ARAK-21 Faxon Upper Receiver

ARAK-21 Faxon Upper Receiver

Regular price
$1,150.00
Sale price
$1,150.00

Owned and used by an employee of Design Machine, in perfect condition, always kept in safe. We believe this is a great deal and figured we would give the opportunity to our valued customers before giving this option to the world.

The ARAK-21 is a gas piston actuated, complete upper receiver assembly designed to seamlessly interface with the standard AR-15 platform.  The total extent of the interface is simply the take down pin, and the pivot pin.  The new ARAK-21® upper receiver offers you all its features with no change to your current lower receiver and can be installed in less than one minute with no tools. 

The BAU is comprised of the barrel, gas block, muzzle brake, gas piston, gas adjuster, and barrel trunnion.  The only removable part of this assembly is the gas adjuster knob.  The gas adjuster knob has 4 settings.  Three of the settings allow different gas flows for optimum operation, and one setting blocks the gas flow for a single shot operation.

The upper receiver includes the charging block, standard charging handle, lower forearm with screws, three aluminum full length picatinny rails, three insulating shims, bolt carrier assembly, lower recoil lug with spring guide rod, and dual recoil spring system.  

Due to the unique and innovative features of the ARAK-21® upper receiver, there are very few parts that are interchangeable with a standard AR-15. The firing pin, extractor spring, and ejector spring are the only parts that are standard and interchangeable with an AR-15 upper receiver.

Other features include:

  • 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.  
  • 12 ½” 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 for single 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 is positioned 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 for better 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 receiver to fully operate.  This eliminates the noise and feel of the buffer tube cycling back and forth.

Offering the upper receiver with your choice of 300 Blackout or Nato 5.56 Barrel. Also will include 20in fluted 5.56 Barrel at additional cost.

*The Faxon upper receiver comes with your choice of 12.5" 5.56 barrel or 12.5" 300 Blackout barrel, and the 3 pic rails as well as their hardware and shims.

*Will sell both the 5.56 and 300 blackout barrels with the upper for an additional price $100.00 (barrels include breaks).

*20 inch fluted barrel seen with break can be substituted or sold separately for a price, please contact us. (This 20 inch barrel is not the ones included with the upper, only the 12.5" barrels pictures are included in prices).

Any other questions feel free to contact us.