Please allow me to use your Holy Bible in my proof.
Matthew 26:52, "'Put your sword back in its place,' Jesus said to him, 'for all who draw the sword will die by the sword.'"
Now, as I see it, this passage indicates that those who use a weapon will die by the same weapon. Thus by buying guns, you're condemning yourself to dying at the hand of one. If that sits aright with you, then continue.
Well shoot, if you all insist on making a religious debate out of this (it should be noted that my faith acknowledges that there are errors in the Bible)...
The scripture must be taken in the context of the chapter. The verses before and after the scripture you quoted make it clear that the instruction being given is relevant to the moment, He is telling Peter (as well as the other Apostles) not to resist the mob since: A) it would result in the Apostles being killed (the verse you quoted), B) the Savior could defend himself anyway but had no intention to do so since His death was necessary (vs. 53,54).
Now, in order to show that the above scripture was taken out of context, let us look to other another scripture. In Luke 22:36 (KJV) it says, "and he that hath no sword, let him sell his garment, and buy one." Here we have specific instruction to purchase a weapon, so unless they were ordered to do die by the sword the only other explanation is that your interpretation is flawed.
It should be further noted that Peter already had used the weapon, and as far as information suggests he did not die by a sword. A glance at history shows that not all who have used a gun, either in combat or otherwise, have died by a gun. With that in mind, if we are going to assume the scriptures to be correct than we must assume that your interpretation of them to be incorrect.
For future note, you also ignored that my faith believes in modern revelation, that the Lord gives guidance specific to the times and situations that His people are in. Just as there were Prophets called before Christ to deliver specific instruction (Jeremiah's message that the Babylonians were coming wouldn't have done much good in Moses' time), and after His death in the New Testament to reveal his will, they are still called today. Since I believe in such, trying to prove that my faith teaches something while ignoring what I consider to be modern scripture on the matter won't get you very far.
In other news, at the suggestion of an Uncle who was quite pleased with a recent purchase a new candidate
has taken the field.