We Tested The New Springfield Echelon 4.0FC - Here's What Happened
This guide details the process of mounting an aftermarket optic onto the Springfield Echelon 4.0FC, leveraging its unique Variable Interface System (VIS) for plate-less mounting. It also covers achieving a proper co-witness with the factory iron sights, a crucial skill for red dot users. The instruction emphasizes safety and proper torque for optic installation.













