The Beretta M9A4 stands out with its red-dot optic compatible slide, dovetailed tritium night sights, and an enhanced short-reset Xtreme Trigger System. Compared to the M9A1, which introduced a railed frame and ergonomic improvements, and the M9A3, which added a replaceable front sight and modular grip options, the M9A4 offers further advancements in customization and performance. The M9A4’s slide can accommodate modern optics, making it ideal for competitive shooting or tactical use, and its upgraded trigger system provides a smoother, more efficient shooting experience. Additionally, the M9A4 features 18-round sand-resistant magazines and textured thin grips for improved handling.