Heckler & Koch Complete MR556 Upper Receiver Kit

The MR556A1 Upper Receiver Kit includes a complete upper receiver/barrel assembly, bolt carrier assembly, buffer, and buffer spring allowing most high-quality 5.56 mm AR-style rifles to be retrofitted to HKs pusher rod system. Specifications for Heckler & Koch Complete MR556 Upper Receiver Kit: Manufacturer: Heckler & Koch Barrel Length: 16.5 in Handguard Type: Free-Float Muzzle Device: A2 Bird Cage Gun Rail: M-LOK Gun Type: Rifle Gun Make: Heckler & Koch Gun Model: Heckler & Koch MR556 Condition: New Magazine Included: No Features of Heckler & Koch Complete MR556 Upper Reciever Complete MR556 Upper Receiver/Barrel Assembly HK 16.5 inch cold-hammer forged barrel, upper receiver with forward assist, extended convertible charging handle, HK Free Floating Rail System handguard Complete MR556 Bolt Group Assembly Tungsten Filled HK Proprietary Buffer HK Proprietary Buffer (Action) Spring NOTE: The MR556A1 Upper Receiver Kit is not classified as a firearm and can be purchased without a Federal Firearms License ( FFL). Package Contents: Heckler & Koch Complete MR556 Upper Reciever Bolt Buffer Buffer spring Rifle length M-LOK handguard 16.5″ medium contour barrel assembly