Midwest Industries HK MP5K End Plate Adaptor, Picatinny, Aluminum, Anodized Finish, Black MI-MP5K-PEPA Built for the classic MP5K platform, this Midwest Insustries end plate adaptor allow for the attachment of a folding stock or brace. Easy to install and crafted from hard coat anodized 6061 aluminum, this adaptor is compatible with the HK MP5K, and several clone variants such as the Century AP5K, Zenith ZF5K, and Military Arms Corporation MAC 5K.