Springfield Armory announced that the St. Louis County Police Department has adopted the Echelon 4.5F 9mm pistol, as stated in Springfield Armory's press release. The announcement was dated December 9, 2025, and issued from Geneseo, Illinois.
What Was Announced
The St. Louis County Police Department has adopted the Echelon 4.5F as its duty pistol. The manufacturer describes the gun as a modular, striker-fired design built around a self-contained, serialized stainless steel chassis that the company calls the Central Operating Group. Grip modules can be swapped in seconds.
Key Details
- Caliber: 9mm
- Action: Striker-fired
- Grip system: Medium grip standard with three interchangeable backstraps; small and large grip modules sold separately
- Controls: Fully ambidextrous
- Optic mounting: Variable Interface System with self-locking pins that fit the footprints of more than 30 popular optics, per the company
What It Means for Gun Owners
The department's armorer, P.O. Jason Dite, said officers finishing transition training liked the pistol's performance and shootability and the ability to tailor the grip to their hands. He also pointed to the trench cuts and slide serrations, and said left-handed officers valued the ambidextrous controls. Those comments come from the department and the manufacturer, not an independent test.
Bottom Line
A police adoption is a notable endorsement for the Echelon line, but the release offers no pricing, availability details, or independent performance data. Buyers who want to evaluate the gun should handle it and check the manufacturer's full specifications before deciding.
