Turn lines on S&W revolvers:
These are S&W revolvers, not Colt. The lockwork between the two is vastly different. All S&W revolvers will have a turn line, even when they leave the factory. Colt revolvers will not. The Colt lockwork pulls the cylinder bolt down and keeps it down until it is near the next stop notch. The S&W design pulls the bolt down just long enough for the stop notch to be rotated far enough that the cylinder can freely turn, then drops the bolt onto the side of the cylinder.
Since the revolver must be dry cycled numerous times during assembly, then go on to be test fired before being packaged for shipping, all S&W revolvers will have a turn line. A sharp edge on the bolt will make the turn line even more visible.
These are S&W revolvers, not Colt. The lockwork between the two is vastly different. All S&W revolvers will have a turn line, even when they leave the factory. Colt revolvers will not. The Colt lockwork pulls the cylinder bolt down and keeps it down until it is near the next stop notch. The S&W design pulls the bolt down just long enough for the stop notch to be rotated far enough that the cylinder can freely turn, then drops the bolt onto the side of the cylinder.
Since the revolver must be dry cycled numerous times during assembly, then go on to be test fired before being packaged for shipping, all S&W revolvers will have a turn line. A sharp edge on the bolt will make the turn line even more visible.