The Springfield Armory Echelon 4.5 blends full-size ergonomics with duty-grade features in a carryable package. Built around Springfield's serialized Central Operating Group and a direct-mount Variable Interface for low-profile optics, it ships with two factory magazines plus the Gear Pac-Viridian RFX11 mounted, four extra magazines, and a premium pistol bag-for a range-ready setup out of the box. Includes the Springfield Armory Gear PacA(R)a |this firearm includes (4) magazines, Viridian RFX11 green dot optic, and premium pistol bag. The optic comes mounted and ready for the range. 9mm 17+1 flush / 20+1 extended 4.5" hammer-forged barrel, 1:10 twist Integral optics Variable Interface system Tritium U-Dot front / rear sights Serialized Central Operating Group chassis Springfield Armory Gear PacA(R): (4) magazines, Viridian RFX11 green dot optic, and premium pistol bag