Hey it never hurts to ask. I have bought 2 new guns and sold 2 guns at Gander Mt. and they had good prices for my new guns and a fair trade in price for my old.
Like most places large or small, they want to move product. That used gun that is the apple of your eye, may have been in the cases for months. Counter guy may phone mgr. and run the lower price by him. Mgr's have sales targets to hit and the worst they could say is no. They might stay with the tag price, but throw in one of their $19.95 gun warranty certificates to sweeten the deal. It includes a free cleaning by the gunsmith within one year of purchase ($40 value).
I ask for discounts at many places I go, up to the big places like Sears. I saw a new rocking chair at Sears once for $79. I ask the salesman about a discount, he said that if I didn't mind him back dating the sale to the day before, he could knock off $20. I had missed the sale the day before.
Ask the Gander Mt. guy. You won't look stupid if you ask with a smile and politely accept his reply. I do that kind of stuff often with good results.