Over the past several years I have found many more Benelli with bolt heads that are full of debries - causing light strikes. This is one of many causes of the issue. Here is a series of photo's that documents the issue fairly well and how to eliminate this as a cause of light strikes. This could lead to better insights when deep cleaning your Benelli at the end of the year as well.
The movement seems pretty normal although the amount can vary a little bit between individual guns. I also have one of @RxArms six position recoil tubes which seemed to lessen my stocks play a bit from the oem if I remember correctly.
I don't think the sound is anything to be worried about. Your stock seems to be locking in to place.
Movement is normal, the sound looks to me like the buttstock pin is compressing a bit, then releasing when it seats back into the groove, causing that sound. I don’t believe it is out of spec, but maybe some others can chime in regarding the sound.