Promag Bersa Thunder Magblock 10/17 (9mm) 10 Round Limiter

This Magblock fits the Promag Bersa Thunder 9mm magazines and will limit them to 10 rounds.  Easily installed in seconds at the base of the spring. The factory locking plate is installed under the block. It is held in place with spring tension alone or can be glued or epoxied if desired. This provides an easy method to convert your factory Bersa Thunder 9mm magazines to 10 rounds. No external modification to the magazine is required. 

- Simple install to make 10/17 Promag Bersa Thunder High Capacity magazines. 
- No modification to the magazine is required.
- Lightweight and will not interfere with magazine reliability.
- Works on original Promag Bersa Thunder magazines as shown in the photos. Other types of magazines will likely require modification of the limiter. 
*Please click on photos for installation instructions. 

If using the Universal Limiter: Cut the universal limiter to between number "19" showing in the indicator notch. Glue flush with the base. The front and back of the base will need to be sanded to better fit into the magazine. *The limiter sold here comes with all of this done.