Experience

There never was a cause for continual embarrassment when a man makes a good honest mistake. We must always remember that the glint of gold in the sands of mistakes is experience.
Richard W Norman

If they pass laws against guns then you will either make your supplies at home, salvage or do without. Below 1) All American Anti-disarmament Handbook, it is a ammo, gun, supply system in a book  you can make just about anything you might need in an emergency, gun manufacture, repair and ammo production with out loading equipment, three different powders and primers and much more. 2) Bullet Casting a War Time Resistance Factory, turning hobby equipment into a continues bullet supply system 3) Boobytraps nasty homemade tools designed by the military. Taking junk and making improvised boobytraps, over 70 titles to chose from  www.firstpatriotpress.com