Genuine Part, not airsoft. For HK416 or MR556 or similar system. Brand new, decided not to use for build. Can use your existing bolt. The item “Heckler Koch HK416 C Stock Geniune” is in sale since Sunday, March 18, 2018. This item is in the category “Sporting Goods\Hunting\Gun Parts\Rifle”. The seller is “silverback76″ and is located in Worcester, Massachusetts. This item can be shipped to United States.