In the US, generally speaking, firearms existing prior to the year 1898 are considered antiques.
They were muskets, knives, cannons, pistols, and rifles. And muskets and rifles are different
Winchester, Mossberg, Remington
If you are talking about things like M4 and M16 then those are just the names of different types of rifles.
Jeff is 17 years old
Do a Google image search.
You need a lawyer familiar with PA firearms law.
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RIFLES AND SHOTGUNS
18 for rifles, 21 for handguns...
Springfield, Lee, Mauser <><><> Would add Arisaka and Moisin-Nagant to the list.
HMS Repulse; and USS Alaska and USS Guam (both armed with 12" rifles).
In the U.S. 18 for rifles and shotguns, 21 for handguns.