Our Sinclair bi-pod adapters allow you to mount your Sinclair or Harris bi-pod to your Freeland or Anschutz style accessory rails or Picatinny rail equipped forend. All aluminum and steel construction insures a lifetime of use. Both accessory rail models will fit Freeland and Anschutz style accessory rails. The Deluxe Model is specially designed to nest in the cradle of the Sinclair Bi-Pod and locks securely in position using two small cap screws, while the Standard Model slips in the accessory rail and is held in position by the tension created by tightening the bi-pod to the stock forend.Picatinny rail bi-pod adapter clamps securely in place using a steel socket screw and lets you install your bi-pod exactly where you want it on Picatinny rail equipped tactical rifles such as the AR-15.