This is an unique back-to-back Picatinny rails adapter. It converts a Picatinny mount to a Picatinny rail. It also lets you mount two accessories back-to-back. Why would you want to do that? Perhaps you want to build a binoculars out of two magnifing scopes... We'll leave that up to your imagination. We can make custom length, with custom number of slots, of this adapter for your need. Contact us for more details. Airsoft equipment used for illustration of this Back-to-Back Picatinny Rails Adapter are not included.