The second amendment is absolute in that it dictates the people have the right to keep and bear “arms” and that such a right may not be infringed. This means no laws against law abiding citizens and what arms they may buy, where they may take them, etc.
The term “arms” is particularly vague for a reason. “Arms” are not limited to just certain types of weapons bureaucrats determine we are allowed to keep and bear. They are all implements of both offensive and defensive capability. If someone wants to buy a tank, they can – if they can afford it. If someone else wants to buy a jet fighter, they can – if they can afford it.
When the types of arms that law abiding citizens are restricted to are inferior to those of any standing army, so also is their liberty restricted.