Echelon 4.0 FC | Springfield Armory
This guide details the installation of a Vortex Defender-ST red dot sight and a Streamlight TLR-7X weapon light onto a Springfield Armory Echelon pistol. It emphasizes proper optic mounting using the Echelon's Variable Interface System (VIS) and correct torque specifications with a Wheeler FAT Wrench. The process includes applying Loctite and witness marks for secure and reliable accessory attachment, as demonstrated by Roger Barrera of QVO Tactical.













