The S15 magazine is a patent-pending flush-fitting 15 round magazine for the Glock 43X and Glock 48. The S15 is a steel magazine and is the same length as the OEM Glock 10 round magazine but holds an additional 5 rounds. - Increased Capacity Same Reliability - Glock pistols and magazines are known for reliability -the S15 maintains that same Glock reliability while giving you a 50% increase in magazine capacity in the same overall footprint. - We accomplished this increased capacity with our patent-pending magazine geometry allowing the rounds to stagger thereby fitting more in the same amount of space. - Proudly made in the USA by Check-Mate. - Specifications - 15 round capacity - Same length as an OEM Glock 43X/48 magazine - Easy to remove impact resistant base pad - High visibility follower - High lubricity finish Black Oxide coating - Made in the USA - Patent-pending