Pro Mag Glock 9MM Plus 2 / .40 S/W Plus 1 Magazine Floor Plates Pack of 2. 40S&W. The floor plates provide an additional gripping surface for more positive control of the pistol. No permanent modification required. Constructed black injected-molded polymer. The PM050 can convert a total of two (2) magazines. Specifications for Pro Mag Glock 9MM Plus 2 / .40 S/W Plus 1 Magazine Floor Plates: Manufacturer: ProMag Magazine Capacity: 0 Round Caliber: 9mm Luger Gun Make: Glock Package Contents: Pro Mag Glock 9MM Plus 2 / .40 S/W Plus 1 Magazine Floor Plates Pro Mag PM050: Glock 9MM Plus 2 / .40 S/W Plus 1 Magazine Floor Plates Pack of