Check out Sportsman’s Warehouse Holdings (SPWH). The seller of guns, ammo, and outdoors equipment says it’s seeing a healthy bump in business since rival Dick’s Sporting Goods (DKS) decided to stop selling heavy-duty guns.

“That’s having an impact on our business,” said CEO Jon Barker on an earnings call Wednesday. The company raised first-quarter sales and earnings guidance as a result. “We’re off to a strong start to the year.… It’s bringing more people into the stores. We’re seeing good traffic.”

“We...