BATFE publishes this data.
florida
arizona
Brownells sells firearms and firearm accessories.
Toyota is the car company that sells the most within the United States. However, GM is a car company that sells the second most in the US.
The company Beretta sells sportsman gear. They specialize in the sale of firearms and also sell all accessories for the avid sportsman. This ranges from firearms to clothing sales.
The company that sells the most turkeys for Thanksgiving is Butterball. This company has a lot of very close competition though.
Buy a copy of Firearms News and check the ads. If there's a company in America who sells the part you need, they advertise in Firearms News.
coke
Toyota
YOu will have to specifiy if you mean in a country or the world.
The com. that sells the most iPhones is Apple com.