Product Description
The 3KEYZ Tactical ARKX 10.5″ 5.56 NATO Complete Upper Build Kit offers a compact, reliable platform for close-quarters builds. Featuring a 10.5″ 4150 CMV barrel with a 1:8 twist and a nitride finish, this upper is optimized for durability and consistent performance. The front-sight base barrel adds a classic touch, while the carbine-length gas system ensures smooth cycling. The anodized A2 upper receiver delivers rugged strength and retro style, paired with a lightweight plastic carbine-length handguard with heat shield. Rounded out with a GI-style A2 birdcage flash hider, 9310-alloy bolt carrier group, and Mil-Spec charging handle — this kit is ready to drop in on a compatible lower.
The ARKX 10.5″ 5.56 NATO Upper is built for reliability, speed, and compact performance. Designed for shooters who want a balance of maneuverability and accuracy, this upper features a durable nitride-treated barrel, a free-float handguard for accessory mounting, and a clean, modern AR-15 profile. Perfect for pistol builds or SBR configurations (where legal), the ARKX delivers consistent performance whether you're at the range or training.
This complete upper includes everything installed and ready to go—just attach to your MIL-SPEC lower and run it. No gunsmithing required.
Key Features
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10.5″ 5.56 NATO Barrel – Nitride for heat and wear resistance
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1:7 Twist – Optimized for heavier defensive/range loads
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Free-Float M-LOK Handguard – Lightweight with multiple mounting slots
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Carbine-Length Gas System – Balanced for reliability
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Complete Upper – Assembled with BCG & charging handle (if included in kit)
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MIL-SPEC Fitment – Compatible with standard AR-15 lowers
Ideal For
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Compact AR pistol builds
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CQB-style setups
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Range and training use
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Budget-friendly performance builds
