Be 18, have money and no criminal record.
No.
18
18 is the federally mandated age so 18
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Buying a gun from a dealer is controlled by Federal law- 18 for a rifle or shotgun, 21 for a handgun.
18 to buy a rifle or shotgun, 21 to buy a handgun or assault rifle.
California has strict gun laws and I doubt that you can legally own a 20MM rifle in California. Usually the only guns available in California are small handguns.
No, you do not need a licence in Florida in order to buy a rifle.
Have never heard of an underwater assault rifle. In the US, you must be 18 to buy a rifle, and 21 to buy a fully automatic rifle.
You would have to first define what a "commando rifle" is.
The legal age to buy a gun depends on the type of gun it is. For an example, to buy a rifle or shotgun(excluding assault rifles) you must be 18 years of age. To buy a handgun you must be 21.
One can buy the M1 Garand rifle from 'CMP Sales'. Their website has pricing details for the rifle, details of where you can find a store to purchase and what are the requirements to be allowed to buy one.