CST Rimfire Receiver: Instructions for Installation of Rear Action Screw Using Pillar Set.
CST Rimfire Receivers were designed with adaptability in mind, including the removable Threaded Rear Tab. The removable Threaded Rear Tab feature allows the ability to build your rifle without the rear action screw that can then be added later at any time, or the ability to remove the rear action screw to try the barreled-action in a different stock.
The removable feature of the Threaded Rear Tab also greatly facilitates the installation procedure as described below:
Notes on stock material:
Wooden or laminate stocks work best with the above procedure and the Rear Pillar Set is highly recommended for these type stocks. Polymer 10/22 type stocks may not be suitable for the rear action screw or rear aluminum pillar as they are often molded with air cavities along the wrist area of the stock. The plastic material also does not allow good adhesion to epoxy when attempting to install the pillar . If there are no air cavities and there is solid material available at the wrist area of the stock, installing the rear action screw via a direct counter-bored hole into the stock without the pillar is feasible.