Sounds like a freak occurrence sort of thing but I guess it's best to be safe
This is cool of them:
Quote:
We understand this is an inconvenience, so when we return the grip frame assembly to you, we will give you an extra magazine, free of charge. That’s a $29.95 value. For customers in states with magazine shipping restrictions, we will send you a ShopRuger.com gift certificate in lieu of the magazine.