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Heckler & Koch
H&K 51000385 MR556 Upper Receiver Kit 5.56mm AR15/M16/M4 A4 Features
UPC642230270220
Manufacturer Part #81000385
HCD SKUHK51000385
Caliber223 REM | 5.56 NATO
In Stock
Ships from the dealer
$2,49900
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Sold by BattleHawk Armory
Piston
Action type
Matte Black
Finish
11 in
Barrel Length
Description
- HK MR556 Upper Receiver Kit 5.56mm - Model 51000385 - UPC: 642230270220 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 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 ships in an HK soft case.
- Specs:
Specifications
ManufacturerHeckler & Koch
Product TypeAccessory
Caliber223 REM | 5.56 NATO
ActionPiston
Barrel Length11 in
FinishMatte Black
Weight8.8 lb
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