Some of the fire control parts are POLYMER, not plastic.
Does that matter? It's not like metal parts can't break or wear out. Matter of fact, some polymers (and I'd guess the kind used in the Storm would be in this category) have a higher stress rating than most metals.
If the polymer is made right, it's bulletproof. If it's made like crap, it's cheap plastic. The same goes for metal parts.
Non issue, or there'd be a ton of reports of broken FCG parts in Storms. There aren't.