Promag PS-90, P-90 MAGBLOCK 10/50 MAGAZINE

- New and Improved Easy Install Design.

- This block will fit original 5.7x28mm Promag PS-90, P-90 Magazines made by Promag.

- The block replaces the factory locking plate and will convert 50 round magazines to hold only 10 rounds. 

- The block can be epoxied to the spring for a permanent modification.

*PATENT PENDING*