18 years old and the law.
You should complete several steps on your way purchasing your first firearm, pistol or longarm.
1) Ignorance is no excuse. Research and KNOW your local laws, state laws, and the federal laws that apply to you.
2) Knowledge is power. Learn all you can about not only the weapon you intend to purchase, but others as well. At least try to learn the basic functions of each action type.
3) The only stupid questions are the ones you don't ask. See if your local range offers a basic course of instruction. If not, look for a hunters education course near you. You may even check with your local law enforcement, as they might know where to turn for at least basic safety training. Don't forget the good old NRA. They offer courses as well.
4) Function over form, everyt time. Consider all of yor needs, all of the laws, and all of your personal restrictions. (budget, ability, familiarity, etc.) before you purchase. Spend time talking to the gun dealers, as well as other shooters at your range. Find a gun the will work best for you, not what everyone else is shooting. Rent different models if you can, to get a feel for what is right for you.
Finally, when you do purchase your gun, think for a minute. Consider three things:
1) This a large responsibility. It requires a great deal of maturity and professionalism.
2) Other people may not all like this. Be prudent in conversations, and try not to brag (too much
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3) Become ACTIVE. Shoot often. Pay attention to politics, both local and national. Continue your firearms education, and ALWAYS BE SAFE. Learn it, live it, teach it.
And then, as soon as you buy your first firearm, rush to your computer and tell all of us so we can drool over it
Good shooting bud.