Accu-Shot Swivel Mounted MonopodsThe original patented Accu-Shot Monopod is the sandbag for the 21st century offering you the stability and support you need. Mounts to your buttstock swivel stud and gives the rear of your rifle a steady, precision adjustable rest when shooting from a bipod or sandbag front rest. It adjusts up and down and then holds dead steady so that you can aim exactly on target. Folds out of the way when not in use. These gun butt mounted mono-pods are adjustable for height: - The BT01-QK adjusts from approx 3.5"-4.65", and - The Locking model BT04-QK adjusts from approx 3.75" to 4.85". BT04-QK LOCKING Model - Features TWO wheel jam nuts (see photo above). These set the tension of the adjustment, giving an extremely steady hold. Quick Knob "QK" Feature - The Quick Knob allows you to disengage the threads and quickly slide up and down for rough positioning, then re-engage the threads for fine positioning (Quick Knob is shown in the photo above with it's push button visible on the side). AR15 Shooters: You may need our 720-BT03 M1-A/AR15 Sling Stud Accessory. See all of our Bipods and Shooting Rests at our EABCO Accessories Page.