HK 416A5/MR223 factory Tan/RAL8000 stripped upper receiver. Includes the 416A5 piston shim/bushing but otherwise stripped. MARKED with 416A5 type markings.
These uppers do require a special barrel nut ( the thread pitch is different than standard 416 and MR556 ) and use a different barrel extension indexing feature. To use an MR556 barrel or standard 416 barrel, you would need to modify either the barrel extension or the upper receiver.
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