Welcome to the forum.
Someone either turned the original barrel down, (although it does not look like much from the photo. Perhaps not at all) and replaced the original sight tower with a turning which was either silver soldered or threaded on. This was probably done to replace a damaged front sight. This repair/alteration affects your friend's pistol's value and makes it a shooter, rather than a collector piece.
What is the barrel's overall length? I ask to determine if it was cut down in any way, as the portion of original barrel showing at the muzzle does not look much smaller than the balance of the barrel's diameter. i
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