HK MR556 Upper Receiver Kit 5.56mm - Model 51000384 - UPC: 642230270213 The HK MR556 Upper Receiver Kit is designed to retrofit Mil-Spec 5.56mm AR-style rifles with HK's advanced piston and pusher rod system.
This innovative system replaces the traditional gas tube, significantly reducing malfunctions by preventing hot carbon fouling and waste gases from entering the receiver.
This technology is a key feature of the HK416, trusted by elite military and law enforcement units.
The kit includes a complete upper receiver/barrel assembly and is shipped in an HK Soft case.
Specs:
Specifications
ManufacturerHeckler & Koch
Product TypeAccessory
Caliber223 REM | 5.56 NATO
ActionPiston
Barrel Length16.5 in
FinishMatte Black
Weight11.3 lb
Shipping & FFL
This item ships directly from the selling dealer to your door. No FFL transfer is
required for this product.
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