This is a Firearm Safety Devices Corporation Lock, model TSA380RCB.
Firearm Safety Devices Corporation offers safety and storage solutions for a large variety of firearms. When applied correctly" FSDC products help prevent accidents and allow you to keep your firearm locked" stored" or transported safely.
Features:
Wear Resistant Cable Cover
Fits Most Handguns, Rifles, Shotguns & MSRs
Easy to Install