So they don't sell guns mags and powder. Big deal.
They're not in the firearms business.
Here's their list
Examples of Prohibited Listings
Guns, such as:
Antique and collectible guns
Automatic guns
Black powder guns
Muzzleloader
Rifles, shotguns, pistols
Sport and hunting guns
Starter guns
Zip guns
Ammunition, such as:
Black powder
Blanks
Bullets
Bullet tips
Gun powder
Shotgun Shells
Gun parts and accessories, other than the above permitted parts and accessories, such as:
Barrels
Camouflaging gun containers
Chokes
Converters that can give a gun automatic capability
Firing pins
Frames, such as components
Kits that can be used to create gun magazines
Magazines
Multi-burst trigger activators
Parts or accessories related to assault weapons
Receivers, such as components
Silencers
Trigger assemblies