Designed for use with most GLOCK G23 pistols, the GLOCK G23 .40 S&W 10-Round Magazine holds 10 rounds of .40 S&W ammunition. The magazine features a metal tube encased in a polymer frame to help resist deformation for long-lasting use. Detachable design. GLOCK G23 .40 S&W 10-Round Magazine - Shooting Supplies And Accessories at Academy Sports