The Accu-Shot Monopods are designed to add stability and provide easy elevation adjustment for bi-pod equipped rifles. The Precision Rail Monopod (PRM) from Accu-Shot attaches to a Picatinny rail and has several applications other than monopod use, such as a folding vertical fore grip. It easily folds up and retracts out of the way when not in use. We're offering the PRM with the factory upgraded "Quick Knob" for faster target acquisition. The "Quick Knob" enables the user to make quick adjustments with the push of a button. Depressing the spring loaded button allows your monopod to slide up or down for gross adjustment so that you can find your desired s Mfg: Accu-Shot