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FAXON ARAK-21® 16" 7.62X39 BARREL ASSEMBLY UNIT
Faxon
$325.00
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Faxon
FAXON ARAK-21® 16" 7.62X39 BARREL ASSEMBLY UNIT
Faxon ARAK-21® Barrel Assembly Unit — 16" 7.62x39 (1:8 Twist)
Modular, quick-swap barrel assembly for the ARAK-21® system — medium profile for balanced handling, velocity, and AK-caliber performance in a rifle-length package.
The Faxon ARAK-21® 16" 7.62x39 Barrel Assembly Unit (BAU) is a complete, self-contained module designed for rapid barrel swaps on the ARAK-21® upper receiver. This assembly integrates the barrel, gas block, muzzle brake, gas piston, adjustable gas regulator, and barrel trunnion — delivering reliable long-stroke piston operation in a versatile, interchangeable format. Ideal for tactical, defensive, hunting, and multi-caliber builds where quick caliber changes, piston-driven reliability, affordable ammo, and 7.62x39 power matter most. SKU: ARAK21BAUONLY-190-16 | UPC: 816341029224 | 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.
- Medium profile barrel: Balanced weight, velocity, and heat management in a 16" configuration for rifle-length accuracy and handling.
- 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
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 without tools, enjoy adjustable gas for optimized cycling (including suppressed use), and benefit from hybrid AR/AK-inspired reliability. The 16" 7.62x39 configuration provides excellent muzzle velocity, energy, and accuracy with affordable surplus or commercial ammo, making it perfect for general-purpose, defensive, or multi-caliber setups 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-190-16 — UPC: 816341029224 — 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, soft point, and match) for defensive, hunting, training, or general use.
Overview: ARAK-21® 16" 7.62x39 Barrel Assembly Unit
The Faxon ARAK-21® 16" 7.62x39 Barrel Assembly Unit provides modular versatility and piston-driven reliability in a medium-profile 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 powerful 7.62x39 configuration, or enabling fast caliber swaps, this BAU delivers innovative value from Faxon Firearms.
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/
- Caliber:
- 7.62x39
- Rifling Twist Rate:
- 1:8
- Muzzle Thread:
- 5/8x24
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