Quite honestly I have never read so much crap about the inside of a shotgun barrel ! The photograph shows some machining marks so what ? Is this going to have any effect whatsoever on the performance of the gun ... NO ... do you spend a great deal of time staring into the wrong end of your gun... NO. Does a gun have to have perfectly polished bores to function properly ... NO.
If you think that Perazzi have not finished the gun properly get in touch with them, if there is a problem, they will fix it. My Browning and Beretta shotguns have perfectly polished barrel interiors ... but compared to my Perazzi they a pile of sh*te. Shoot the gun, enjoy and stop worrying about something that is totally inconsequential.