I'd take it back to Gander Mountain. They usually have a gunsmith on the premises. Even if that store doesn't, they should fix it. Present it to them as a safety problem.
If you don't get satisfaction, report that store to corporate. You might also get help from Remington, since Gander is an authorized dealer. Your final resort is a gunsmith of your own choosing. Send the bill to Gander corporate with an explanation. Good luck.
When the Everyday Hunter
isn't hunting, he's thinking about hunting, talking about hunting, dreaming about hunting, writing about hunting, or wishing he were hunting.