FAXON ARAK-21® 12.5" 7.62X39 BARREL ASSEMBLY UNIT

FAXON ARAK-21® 12.5" 7.62X39 BARREL ASSEMBLY UNIT

Faxon
SKU:
ARAK21BAUONLY-190S-12
|
UPC:
816341029217
Availability:
Usually ships within 2 business days when available.
$325.00
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Description

Faxon ARAK-21® Barrel Assembly Unit — 12.5" 7.62x39 (1:8 Twist)

Modular, quick-swap barrel assembly for the ARAK-21® system — heavy profile durability in a compact package for enhanced heat management and reliability.

The Faxon ARAK-21® 12.5" 7.62x39 Barrel Assembly Unit (BAU) is a complete, self-contained module designed for rapid barrel swaps on the ARAK-21® upper receiver. This heavy-profile assembly integrates the barrel, gas block, muzzle brake, gas piston, adjustable gas regulator, and barrel trunnion — delivering reliable long-stroke piston operation in a compact, interchangeable format. Ideal for tactical, defensive, SBR/pistol builds, suppressed use, and multi-caliber setups where quick caliber changes, piston-driven AK-inspired reliability, and 7.62x39 performance matter most. SKU: ARAK21BAUONLY-190S-12 | UPC: 816341029217 | MSRP: $325.00

Key Benefits

  • Modular BAU design: Quick-swap barrel assembly for the ARAK-21® — change barrels in seconds with minimal tools.
  • Long-stroke gas piston system: Adjustable 4-position gas regulator (3 flow settings + off for single-shot) for tuned reliability and suppressor use.
  • Heavy profile barrel: Enhanced durability, heat dissipation, and stiffness in a short 12.5" configuration for compact handling and sustained fire.
  • Premium materials: Gun-drilled, reamed, button-rifled from high-quality 4150 CMV steel, fully QPQ black nitride finished for corrosion resistance and longevity.
  • Integrated components: Includes gas block with clean-out port, piston, adjustable gas knob, muzzle brake (5/8x24 threads), and trunnion — all pre-assembled.
  • Precision manufactured: Made in Cincinnati, OH by Faxon — ensures consistent accuracy and performance in the ARAK-21® platform.

Specifications

Caliber
7.62x39
Length
12.5"
Profile
Heavy
Material
4150 CMV
Rifling
Button-rifled, 1:8 twist
Finish
QPQ Black Nitride
Gas System
Long-stroke piston, adjustable (4 positions)
Muzzle Threads
5/8x24
Included Components
Barrel, gas block, muzzle brake, gas piston, gas adjuster, barrel trunnion
Gas Adjuster
4 settings (3 flow + off for single-shot)
Compatibility
ARAK-21® upper receiver only (quick-swap via pivot pin & keys); requires 7.62x39 bolt
Weight
2 lbs
Manufacturing
Faxon Firearms, Cincinnati, OH

Why Choose the ARAK-21® Barrel Assembly Unit

The ARAK-21® BAU enables true modular performance in a piston-driven platform — swap barrels/calibers quickly with minimal tools, enjoy adjustable gas for optimized cycling (including suppressed use), and benefit from the hybrid AR/AK-inspired reliability. The 12.5" heavy profile 7.62x39 configuration delivers compact maneuverability, superior durability, and excellent performance with affordable surplus or commercial ammo, making it perfect for short-barreled defensive, tactical, or multi-caliber experimentation on your ARAK-21® system.

Installation & Compatibility

  • Designed exclusively for the ARAK-21® upper receiver — installs via pivot pin and forearm keys in seconds.
  • Integrated long-stroke piston and adjustable gas block — supports suppressed fire and tuned operation.
  • Includes pre-installed muzzle brake (5/8x24 threads); compatible with ARAK-21® bolt carrier and recoil system (requires 7.62x39-specific bolt).
  • SKU: ARAK21BAUONLY-190S-12 — UPC: 816341029217 — for 7.62x39 use only.

Frequently Asked Questions

What is included in the BAU?
The assembly includes the barrel, gas block, muzzle brake (5/8x24), gas piston, adjustable gas knob, and barrel trunnion — ready to install on your ARAK-21® upper.
Is this compatible with standard AR-15 uppers?
No — this BAU is for the ARAK-21® upper only, which interfaces with standard AR-15 lowers via takedown and pivot pins.
Can I use this with a suppressor?
Yes — the adjustable gas system (4 positions) allows tuning for suppressed operation; the long-stroke piston enhances reliability.
What twist rate and bullet weights are supported?
The 1:8 twist stabilizes a wide range of 7.62x39 loads, typically 123–154 grain bullets (including surplus FMJ, soft point, and match) for defensive, hunting, training, or general use.

Overview: ARAK-21® 12.5" 7.62x39 Barrel Assembly Unit

The Faxon ARAK-21® 12.5" 7.62x39 Barrel Assembly Unit provides modular versatility and piston-driven reliability in a heavy-profile compact design with 5/8x24 muzzle threads. Manufactured with precision gun-drilling, button rifling, and QPQ nitride finish, it integrates all key gas system components for quick installation and superior performance.

Every ARAK-21® BAU is built at Faxon Firearms for consistent quality, with an adjustable long-stroke piston system that offers 4 gas settings for optimized cycling across various conditions. Whether upgrading your ARAK-21® setup, adding a short-barreled 7.62x39 configuration, or enabling fast caliber swaps, this BAU delivers innovative value from Faxon Firearms.

Warranty
Faxon Lifetime Guarantee. Covers manufacturing and material defects to the original purchaser. Excludes damage from misuse, neglect, non-standard ammunition, or modifications. Register your product at faxonfirearms.com/product-registration to expedite service. For purchases through dealers or distributors, warranty repairs are handled directly by Faxon Firearms; refunds must be processed through the selling entity. Full policy: faxonfirearms.com/warranty-privacy-terms/
Additional Information
Caliber:
7.62x39
Rifling Twist Rate:
1:8
Muzzle Thread:
5/8x24
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