There are many retailers which sell gun safes, including Target and Wal-Mart in states where you can buy hunting rifles and other firearms at general department stores. Your local gun and ammo store carries them as well.
No guns or ammo
Companies that make firearms, ammunition, and components of ammo.
Yes.
Stovepiping due to loose handling (limp wristing) of the firearm, use of poor quality ammo (particularly, poorly done reloads and use of cheap ammo in firearms which are picky about ammo), poor maintenance of the firearm, incorrect assembly of firearms built from components or parts kits.
Need a rifle, ammo, target, tools.
Only in firearms chambered for it. SIG comes to mind, but, there are others.
Federal law states that it is illegal for a felon to posses firearms or ammunition.
Whether you do or not depends on where you live. As for countries not requiring a licence to buy .22 ammo, the United States is one.
Sporting good stores or Walmart
The kind that renders a target lifeless.
http://ag.ca.gov/firearms/forms/pdf/Cfl2007.pdf