Improvised weapons

Something that has been on the minds of a lot of preppers lately is the possibility of the suspension of the 2nd amendment rights to bear arms. In the event of a declaration of a national emergency, the President has the power to suspend the rights given to citizens under the constitution. Many people don't know this, but agents of the state can be given the authority to take EVERYTHING you own, Imprison you, and sell your property for profit. In a smaller fashion, this is already commonly done with criminals. If, for example, you are caught manufacturing controlled substances on your property without a license, authorities can claim the entire property and all its contents.  (Farmers, be careful about storing your ANFO!)

Back on topic...
It is easy to create a wide assortment of firearms (as well as heavier weapons and artillery) with just a little know how and the tutelage of a few experts. Personally, I promote several books by Ragnar Benson.
Home and Recreational uses for High Explosives
Improvised Weapons
Breath of the Dragon
Build your own Grenade Launcher
and many more!

I am warning you right now to spend REAL time researching this and know your facts before you attempt to build your own weapons, as you can ACCIDENTALLY KILL YOURSELF OR SOMEONE ELSE if you screw up.