You say you support the right to bear arms, yet you suggest that civilians do not need military style weapons. This betrays a misunderstanding of the purpose of the second amendment. Unfortunately this is entirely too common, its probably not even your fault and I'm glad you are asking this question. I hope that I can answer it adequately.
Let's start with the text of the second amendment shall we? It is:
A well regulated Militia, being necessary to the security of a free State, the right of the people to keep and bear Arms, shall not be infringed.
The amendment consists of two parts, the introduction which states the reasoning for the amendment and the actual right to be protected. "To keep and bear arms" is relatively straight forward, it means people have the right to own and carry weapons. Note that it doesn't say "The people shall have the right to keep and bear arms." That would imply the government is granting the right to the people. Rather it says "shall not be infringed," implying that the right to arms is a preexisting right that no government can legitimately take away.
That aside, typically people get hung up on the "well regulated militia" part. They argue that this means the army should have the right to arms, but not the people. The amendment clearly states that it is the people whom have the right to keep and bear arms though and the SCOTUS acknowledged this in DC vs Heller and again in Chicago vs McDonald. The second argument that is typically made is that the word "regulated" implies that the government has the right to restrict how people may exercise their second amendment right. However, there is two problems with this argument. The fist is that this statement takes place in the introduction of the amendment. The legal aspects of the second amendment can be completely understood by everything after the comma. "The right of the people to keep and bear Arms, shall not be infringed." That's all we need, but the framers decided to include the WHY not just the WHAT.
The second problem is that "regulated" doesn't mean the same thing today as it did in 1787 when the Constitution was adopted. In that time, "well regulated" in regards to a militia or a military unit would have meant "properly disciplined." It also helps to remember the context. The revolutionaries had just fought a war against a regular army, the most powerful army in the world at the time, with "untrained civilians." They had no idea what would happen with the new government they were creating, but they knew that most often governments used their armies against the people. Ensuring that the people were able to keep and train in the use of arms was another check on the power of the government. Consider Jefferson:
And what country can preserve its liberties, if its rulers are not warned from time to time, that this people preserve the spirit of resistance? Let them take arms. The remedy is to set them right as to the facts, pardon and pacify them. What signify a few lives lost in a century or two? The tree of liberty must be refreshed from time to time, with the blood of patriots and tyrants. It is its natural manure.
Which brings us to the conclusion of the matter. The purpose of the second amendment is not to protect the rights of hunters, target shooters, or the right to self-defense. It is to protect the people from the government. Consider Madison:
Besides the advantage of being armed, which the Americans possess over the people of almost every other nation, the existence of subordinate governments, to which the people are attached, and by which the militia officers are appointed, forms a barrier against the enterprises of ambition, more insurmountable than any which a simple government of any form can admit of.
So if the purpose of the second amendment is to defend the people from the government, and the government controls the military, then military arms are necessarily what the second amendment is referring to. Every person has a right to life, yes, but remember that governments have killed more of their own people in the 20th century than all wars in this century combined. Gun control almost always comes before genocide (see the Death by Gun Control chart)
All in all, any gun is dangerous, but remember that more people die in car accidents than from shootings every year. Should we ban cars? Or maybe just restrict everyone to compact cars so they can't do as much damage? Guns are tools, if someone hurts someone else with a tool they should be severely punished, but banning the tool takes the blame from bad people and places it on tools, which are neither good or bad.
I hope this at least partially answers your question and that you'll continue to search for answers on your own. Unfortunately the mainstream media has painted guns and gun owners in an incredibly dismal, and inaccurate, light. You won't find truth there. I'll give you one more resource, Penn and Teller's take on gun control (not academic I know but entertaining and gets some good points across!) and then I'll stop pontificating. Good luck and thanks for reading.