Caldwell Prone Bipod, Attaches to Picatinny Rail, Fits AR Rifles, Black 531123 Caldwell's AR-15 Prone Position AR Tactical Bipod with Picatinny attachment combines a quick attach system for securing to any picatinny rail with all of the other outstanding features that you have come to expect from Caldwell. This Bipod from Caldwell is made with built in systems for both pivot and cant movements that give the shooter maximum range of alignment without having to reposition the bipod. The unique internal spring system on the Caldwell AR Bipod" Prone Model is both low profile and quiet. The unique leg adjustment mechanism on the Caldwell AR Bipod delivers fast and secure" no-wobble height positioning. Rubber feet ensure good grip on all surfaces. Lightweight and durable anodized aluminum construction.