The 2A says "ARMS" as in a "Standard of Arms" a Standard of Arms is a Rifle a Pistol, a bayonet and any powder and shot which is ammunition and any powder horn or web gear to carry it in. It may also include a sword if its for an officer.
So the 2nd article of amendment covers ammo!
The claim that the 2A doesnt cover ammo is an argument put for by the left but it doesnt stand the facts of history
PS. The USA was making 40,000 standards of arms a year for public arms by 1803. Thanks to the efforts of the office of Arms purator ran by Tench Coxe. Coxe started using a power trip hammer that year at harpers Ferry to make rifle barrels production was greatly increased.