Brugger & Thomet B&T USW-A1 Magblock 10 Round Limiter for 17 Round Factory Magazines

This Magblock fits the B&T USW-A1 Full-Size 17 round magazines will limit them to 10 rounds. Easily installed in seconds at the base of the spring. It is held in place with spring tension alone or can be epoxied if desired.

- No external modification to the magazine is required.

- Lightweight and will not interfere with magazine reliability.

- Tested on B&T USW-A1 factory magazines made as shown in the photos. 

*If using our Universal Limiter for this magazine: Cut to #15 and glue flush at the bottom for 10/17 limiter. Slide lock is not used. When epoxy cures assemble magazine. #15 will show in the limiter window notch like in the photos.