Heckler & Koch MR556A4 Upper Receiver Kit 5.56 16.5 Black
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HK 51000384 UPPER RECEIVER KIT MR556A4 16.5″
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Description
Specifications
- Short Stroke Gas Piston Gas System (Rifle Length)
- 18.6″ Barrel Length ( Mid-Weight style, non-fluted)
- 1:8 Twist Rate Rifling
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