Just a thought. Don't blame Sako. I'm fairly sure the parent company Beretta is the one who made the final decision to use the plastic.
Beretta, while they make some excellent and fine shotguns and a company with a long firearms history-I think it is the longest privately held company at over 500years-is notorious for doing things on the cheap.
For whatever reason, it was not a great day for Sako when they sold out to Beretta.
