The gun has been worked on. That firing pin is certainly NOT normal and the gun would never have gotten past the factory inspection, let alone through the Italian proof house with that kind of defect. With no retraction spring, the firing pin can easily interfere with feeding and hang up the gun and/or damage the slide and firing pin. Worse, the firing pin could stick forward and cause an out-of-battery firing which would destroy the gun and possibly injure the shooter.
The firing pin spring is listed on
www.e-gunparts.com and I suggest you purchase one and install it.
JIm