The G45 MOS 9x19mm compact crossover pistol integrates a compact slide with a full-size frame, offering the comprehensive advantages of a Gen 5 model. The slide, configured for modular optic system (MOS), facilitates the straightforward installation of a reflex sight directly onto the slide, eliminating the necessity for a replacement slide or additional mounting apparatus. This design leverages Glock’s engineering expertise from the military-grade G19X, tailored to meet operator and global law enforcement standards. The slide is coated with Glock’s durable nDLC finish in a non-reflective black, ensuring superior surface protection. It features front serrations (FS) that enhance tactile feedback, providing reliable grip even in adverse conditions such as wet or sweaty environments. The frame, also in subdued black, includes a flared magazine well to expedite reloads during critical operations. Additional enhancements comprise a smoother trigger pull, improved grip texture for secure handling, a reversible magazine catch, an ambidextrous slide stop lever and the modular backstrap system (MBS) for personalized fit adjustments. The pistol is equipped with the Glock Marksman Barrel (GMB), renowned for its precision and reliability. The G45 MOS represents a significant advancement in service pistol performance, rigorously tested and unmatched in its class.