Caldwell Bipod Adaptor for Picatinny Rail Anodized Aluminum -The Bipod Adaptor is lightweight, featuring machined anodized aluminum construction that provides durable and reliable performance. The two integrated fasteners ensure a secure attachment to the picatinny rail, and will not rattle loose during heavy use. Allows you to attach any traditional bipod or sling to a picatinny rail Lightweight, durable machined aluminum construction Won't rattle loose under heavy recoil!