Hk51000384
Heckler and Koch (HK USA)
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Description
Description
MR556A4 UPPER KIT 5.56MM 16.5″
Specifications
- Short Stroke Gas Piston Gas System (Rifle Length)
- 18.6″ Barrel Length ( Mid-Weight style, non-fluted)
- 1:8 Twist Rate Rifling
