Description
Overview:
The HK MR556 upper receiver kit offers a factory-quality upper assembly designed to fit AR-15/M16/M4 platforms. Built to HK’s rigorous standards, this 11" kit pairs a precision 5.56mm barrel with a full-length Picatinny receiver interface for reliable accuracy, robust accessory mounting, and service-grade durability in a compact package.
Key Features:
Brand: HK (Heckler & Koch)
Series / Model: MR556 — Upper Receiver Kit
Category: Uppers
Caliber: 5.56mm
Firearm Fit: AR15 / M16 / M4
Color / Finish: Black
Barrel Length: 11"
Applications:
Ideal For: Compact carbine builds, patrol / duty uppers, and short-barrel rifle (SBR) style configurations (where legal).
Use Case: Builders and armorers seeking a factory-style upper with HK fitment and accessory-ready Picatinny interface.
Additional Features:
Accessory Ready: Full-length Picatinny receiver interface for optics, sights, and mounts.
Handguard / Mounting: Designed to accommodate standard accessory mounting and rail systems.
Durability: Finished in black to match common AR components and provide corrosion resistance.
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$1,999.00
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$24.99 | |||
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14.31 | |||
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19.99 | |||
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$2,179.00
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$2,238.75
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19.99 | |||
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$19.99 | |||
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$2,481.99
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45.00 |
