The Springfield Armory Echelon 4.5F Gear Pac is the full-size, California-compliant configuration of Springfield's modular Echelon 9mm pistol. Built on the Central Operating Group (COG) serialized fire control chassis, the 4.5F pairs a 4.5-inch Melonite-finished hammer-forged barrel with a matching full-length slide and duty-sized grip frame.The Gear Pac bundle includes a factory-installed Viridian RFX11 green dot optic, four 10-round magazines, Springfield's U-Dot fixed iron sights, and a soft case. Variable Interface System optic mounting supports direct mounting of most popular micro red dots without adapter plates. Aggressive Adaptive Grip Texture, flat-faced striker-fired trigger, and ambidextrous controls make the Echelon 4.5F well suited for home defense, duty carry, and range training within 10-round capacity states.This firearm must be transferred through a licensed FFL dealer.