Do the Gauntlets of Flaming Fury infuse ranged weapon ammunition with magical properties?

The description of the Gauntlets of Flaming Fury says:

While you wear both of these steel gauntlets, any non-magical weapon you grasp with either gauntlet is treated as a magic weapon.

Does this property infuse both a ranged weapon and the ammunition being fired with this magical property, or just the ranged weapon and not the ammunition?