HK 51000384 MR556 Upper Receiver Kit 5.56mm for AR15/M16/M4

This kit includes a complete upper receiver/barrel assembly, allowing Mil-Spec 5.56mm AR-style rifles to be retrofitted to HKs piston and pusher rod system. This system utilizes a piston and a pusher rod in place of the gas tube normally found in AR15/M16/M4-style rifles. This closed system virtually eliminates the malfunctions that are common in direct-impingement gas systems, since hot carbon fouling and waste gasses are not propelled into the receiver area to operate the action. This is the same key feature critical to the success of the HK416 used by elite military and law enforcement customers. Upper will ship in HK Soft case.

Manufacturer	HK
Caliber	5.56mm
Compatibility	AR15/M16/M4
Model	kit
Platform	AR-15
Product Type	Complete Upper

Reviews

There are no reviews yet.

Be the first to review “HK 51000384 MR556 Upper Receiver Kit 5.56mm for AR15/M16/M4”

You must be logged in to post a review.

HK 51000384 MR556 Upper Receiver Kit 5.56mm for AR15/M16/M4

Reviews

Related products

Spikes STU5435R2S Complete Upper 5.56x45mm NATO 16″ Black Phosphate/Midlength Barrel, 7075-T6 Aluminum Black Receiver, 12″ SAR3 Free-Floating Handguard for AR-15

Spikes STU5025M4S Complete Upper 5.56x45mm NATO 16″ Black Phosphate Barrel, 7075-T6 Aluminum Black Receiver, M4 Double Head Shield Handguard for M4 Carbine

BCM 4URM4 BCM M4 Upper Assembly Multi-Caliber 7075-T6 Aluminum Black Anodized Receiver for AR-15

Aero Precision APAR308503AC Assembled Receiver 308 Win 7075-T6 Aluminum Black Hard Coat Anodized Receiver for M5 Platform

Aero Precision APAR501801AC Assembled Receiver Multi-Caliber 7075-T6 Aluminum Flat Dark Earth Cerakote Receiver for AR-15