S&W 686/586 .357 or 38 Special ECI (Empty Chamber Indicator)
thingiverse
ECIs, or Empty Chamber Indicators, are a common sight on rifles at shooting ranges everywhere. They serve as a crucial visual cue for fellow range users, signaling that your firearm is safely unloaded when you're handling it, moving around, or not actively engaged in shooting - even while standing off the firing line. These handy devices add an extra layer of protection by blocking the trigger from being pulled or the hammer from being cocked, ensuring a safe and incident-free experience for everyone on the range.
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