MR762 A4 Upper Receiver Kit – 16″

Updated to include all the new A4 features, this kit includes a complete upper receiver/barrel assembly, allowing Mil-Spec 7.62mm AR-style rifles to be retrofitted to HK’s piston and pusher rod system — the same key feature critical to the success of the HK417.

The MR762 A4 Upper Receiver Kit is not classified as a firearm and can be purchased without an FFL. View full specs and dealer options on the official HK USA site.