The RAP4 UMP Stock offers many unique features that will allow you to easily achieve the UMP submachine gun look and feel. The metal adapter is durable and offers a tight attachment point to your marker. Push the button and fold the stock to the right for close quarter situations. All UMP Stock adapters are interchangable and upgradeable to an air-thru configuration.

A5 Models fits all markers that accept the A5 stock adapter.