Faxon Firearms URSSB556 ARAK-21 Complete Upper Receiver, Piston Operated, 556NATO, AR-15, 16 Inches, Picatinny, Matte Black

The Faxon Firearms ARAK-21 is a versatile upper receiver assembly that brings advanced piston operation to your AR-15 setup, ensuring smooth and efficient performance in various conditions. Seamlessly interfaces with standard AR-15 lower receivers using just the takedown and pivot pins for quick, tool-free installation in under a minute. Features a gas piston system with an adjustable knob offering three gas flow settings for optimal cycling and one for single-shot mode, providing flexibility for different shooting scenarios. Includes a robust barrel assembly unit with a 16-inch barrel, integrated gas block, muzzle brake, and trunnion for enhanced durability and accuracy. Comes equipped with full-length Picatinny rails on three sides for easy attachment of accessories, along with insulating shims to manage heat during extended use. Designed for compatibility with 556 NATO caliber, it incorporates a dual recoil spring system and lower recoil lug to reduce felt recoil and improve control. Ideal for enthusiasts seeking a reliable upgrade, this upper receiver emphasizes precision engineering and ease of maintenance for long-term reliability.

Features:

• Upper receiver is fully machined from an aircraft grade 6061-T6 aluminum billet in a one piece design.
• Top picatinny rail is laser engraved for optic placement.
• Long stroke variable setting gas piston system.
• Three options for gas flow, and one for no gas flow.
• Charging handle is ambidextrous, non-reciprocating, foldable, spring returned and is easily relocated from left to right side without tools.
• 3 o'clock extractor position allows for easy swap between right and left handed shooting.
• Self-contained firing pin retention system enclosed in a rectangular bolt carrier that no longer requires a cotter pin.
• Recoil system does not extend beyond the upper receiver to fully operate allowing for easy install of a folding stock.

Specifications:

• Fit: AR-15
• Accessories: Bolt Carrier Assembly & Charging Handle
• Type: Upper
• Manufacturer Part: URSSB556
• Color: Black
• Manufacturer: Faxon Firearms
• Model: ARAK-21
• Sub Category: Complete Upper Receivers
• Barrel Length: 16"
• Caliber: 556NATO