The heart of the Echelon 4.0C is its self-contained Central Operating Group, which allows easy customization and modularity across grip frames and slides. The optics-ready slide is milled to accept a wide range of red dots, and comes pre-equipped with the high-visibility Viridian RFX11 red dot optic. The 3-dot night sights offer excellent low-light aiming capability and co-witness with most optics setups. Its black melonite finish adds exceptional durability and corrosion resistance to the steel slide, while the black polymer frame provides a secure grip and lightweight profile. Backed by Springfield's innovation and quality, this Gear Pac equips shooters with every tool they need for carry, defense, or range work.