Heckler Koch HK MR556 A4 Complete 11" 5.56 AR15 Upper Kit Gas piston New

New in box Heckler Koch MR556 A4 Complete AR15 Gas piston 11" upper receiver kit!  Comes factory new in soft case with buffer spring, buffer, BCG, Ambi charging handle and manual!  These are no longer legal for sale in Washington state.   Will not ship if your state has restrictions on these.  Credit card billing and shipping address must match.   Shiping is to the lower 48 states.  If shipping to Alaska contact us first for a quote.  Ships UPS Ground insured with adult signature required to credit card billing address.  This is a pistol or SBR/NFA item depending on the classification of lower you are installing it on so check your local laws and fed/NFA laws before purchasing. 

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.

Please allow 2-3 days for items to ship once payment has been received.

Long guns and accessories ship UPS Ground. Handguns are shipped USPS priority mail.

NO CREDIT CARD FEES!

Serial numbers & markings may vary