The ARAK21 is a gas piston actuated, complete upper receiver
assembly designed to seamlessly interface with the standard AR15
platform. The total extent of the interface is simply the
take down pin, and the pivot pin. The new ARAK21 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.
Your ARAK21 upper receiver will be shipped to you with one
"Barrel Assembly Unit" (BAU), or two, depending on which package
you purchase.
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. Along with your new ARAK21 upper receiver you
will receive your owners manual, and two allen wrenches that will
fit the screws that attach the lower forearm, and the front
picatinny rails
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