HK MR556 Upper Receiver Kit w/ Buffer and Spring

HK MR556 Upper Receiver Kit w/ Buffer and Spring

Price: $1,899.00
SKU: HK-MR556URG
UPC: 642230247505
Out of stock
as of 12/16/2018 11:45AM CST


Store Inventory
Available OnlineOut of stock
Fountain Valley, CAOut of stock
Plano, TXOut of stock

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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. The Upper Receiver Kit is the core of the HK 5.56 mm proprietary gas piston operating system. It employs a piston and a solid operating “pusher” rod in place of the gas tube normally found in AR15/M16/M4-style firearms Due to the shortened length of the HK buffer and HK  (action) buffer spring, these parts do not work in fixed stock AR-type rifles. 

Installation of MIL-SPEC hammers in non-HK lower receivers is required for reliable function. Notched hammers and reduced weight hammer springs are not compatible with this upper.

Additionally, the MR556A1 Upper Receiver Kit does not work in lower receivers with fully automatic or selective fire mechanisms.

Features
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


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