Shooters Ridge Deluxe Bi-Pod 9-13-Inch with Picatinny Rail Mount and Swivel Stud Adaptor Quickly and easily attaches to Picatinny rail Contains Swivel Stud Picatinny Rail Adaptor for attachment to firearms with swivel studs Bi-pod cants, swivels and locks down tight via large ergonomic lever Twist lock legs eliminate the noise common to spring release bi-pods Aluminum legs twist lock in either direction and make bi-pod 30% lighter than comparable models