Heckler & Koch MR556 5.56x45 NATO 16.5in MLOK Upper Receiver Kit

SKU HK 81000584
UPC 642230262607

Caliber5.56x45 NATOBarrel16.5"ActionSemi-AutoFitsAR-15

$2,169.0023% OFF

$1,678.34You save $490.66

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Out of StockFFL Transfer Required

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Heckler & Koch MR556 5.56x45 NATO 16.5in MLOK Upper Receiver Kit

$1,678.34

$2,169.0023% OFF

$1,678.34You save $490.66

Buy now, pay later with Sezzle

Out of StockFFL Transfer Required

Ships to your local FFL dealer

Federal law requires firearms ship to a licensed dealer near you — pick yours at checkout and finish a quick background check at pickup.

Trusted Since 2013
A+ BBB Accredited
35,000+ Reviews
Secure Checkout

Heckler & Koch MR556 5.56x45 NATO 16.5in MLOK Upper Receiver Kit

$1,678.34

About the Heckler & Koch MR556

The MR556A1 Upper Receiver Kit includes a complete upper receiver/barrel assembly bolt carrier assembly buffer and buffer spring allowing most high-quality 5.56 mm AR-style rifles to be retrofitted to HK's pusher rod system. - Complete MR556 Upper Receiver/Barrel Assembly HK 16.5 inch cold-hammer forged barrel upper receiver with forward assist extended convertible charging handle HK Free Floating Rail System handguard - Complete MR556 Bolt Group Assembly - Tungsten Filled HK Proprietary Buffer - HK Proprietary Buffer (Action) Spring