For a semiautomatic rifle, you must be 18. For a TRUE assault rifle, which is capable of burst or full auto fire, you must be 21. Federal law.
yes
Yes
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.
The SKS is not an assault rifle, nor even a BATFE-defined "civilian assault weapon". And no, a permit is not required.
18 for long guns like rifles and shotguns, 21 for handguns. The so called "assault rifles" are just really semi automatic rifles that look like military guns.To own an NFA firearm, such as a short barreled rifle or shotgun, or a true assault rifle with the selective fire functions, the minimum age is also 21.
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.
There is no assault rifle in Halo 2. They replaced it with the battle rifle which in it's own way is pretty good.
STG 44 1940 (Nazi) techinically an assault rifle due to the rifled barrellbut it was developed off of the machine pistol 40. the first "true" assault rifle in it's own right is the automatic kalashnikov 47. this is the most known and is tsill used today
If it's an ongoing felony charge, or a felony conviction, no.
In MOST states it is 18 to own any shoulder-fired weapon. In order to own what the military considers an assault rifle, you also have to have a Class 3 Federal Firearms Lisence, but some states and cities definition of an 'assault rifle' includes anything that looks dangerous and NO ONE is allowed to own one there.
If you own one and don't know how, recommend you finda Class III dealer and ask for help.
Depends on the laws where you live.