Kind of a left-field one. Silver bullets - are they commonly manufactured by anyone, or do they have to be special-ordered? Is there any popular (or practical) use for this type of ammo?
Actually, most silver is too soft to reliably feed in any autoloaders and would deform out of shape under the recoil of a revolver. The best way to get silver into a gun is to buy a box of hollowpoints, then melt the silver into the hollow cavities. Won't work for a sharp pointed rifle, but a .44 Magnum leverl action Winchester, or a .45 ACP Thompson fits a lot of silver in the nose.
and somone talk to me about the SPAS-12 or the Jackhammer. which is harder to get ahold of, and how much trouble would someone be looking at for being caught with either?
The SPAS-12 was a legal shotgun, but it's no longer in production. It just looks mean as hell. The Pancor Jackhammer, however is rare and HARD to get hold of. It's also classified as a "destructive device" - without the right licenses, it's as illegal as an M-60 Machine Gun, an RPG-7 rocket launcher or an M-203 grenade launcher.
But, if you need it, the Jackhammer has a 10-round circular cassette of 12 gauge shotgun shells that literally goes full-auto. With the right buckshot, you're looking at 6000 rounds per second of .36 caliber pellets.
Fun side note: the Pancor shotgun magazine can be loaded into an anti-personnel mine. When someone steps on a properly rigged magazine, it fires 10 rounds of buckshot into an upward facing cone, destroying the legs and lower torsos of anyone in the vicinity.