Is it legal in California to own a slam-fire shotgun? No, unless you want to get arrested. Such weapons are classified as "zip guns" and are prohibited to manufacture in California, as a quick Google search would reveal.
However, since they are not regulated by the Bureau of Alcohol, Tobacco, and Firearms (ATF), one could potentially buy such a gun on the open market from another state where they are licensed. In fact, according to the ATF website, several companies do sell slam-fire shotguns under their own brand names. So if you're willing to risk it, you can keep one in your home. However, since these guns use expansion barrels, which are only required on pump-action firearms, if police find you with one they will most likely assume that you're also carrying around a pump-action shotgun and arrest you for that too.
The best way to avoid getting arrested for having a slam-fire shotgun is to not possess one in the first place. Since they are considered zip guns, you cannot have one in your vehicle either.
However, if you already have one and don't worry about getting arrested, then you should know that being caught with it is only a misdemeanor offense.
While these guns can be bought online from manufacturers outside of the state, they are also illegal for sale within California's borders.
In addition to being illegal to sell within the state, slam-fire shotguns are also not allowed as carry items. This is because they use mechanical parts that function like a trigger lock, preventing the gun from being fired unless you release the latch which allows the hammer to fall.
California has some of the strictest gun control laws in the country, so if you're looking to buy a firearm here then you'd better find out first how easy it is to acquire one legally.
Making the Slam Fire Shotgun It is allowed for gun owners to make their own guns as long as they can legally own and possess what they are creating—convicted felons or other forbidden individuals cannot. There may be further restrictions in your area, so double-check. To make a slam fire shotgun, you will need a functional pump action shotgun that can hold more than 3 shells at once; a hammer or another device that can be activated by pulling the trigger; and a release mechanism that can be found online or with a tool kit. Users must comply with all local laws while making their own firearms.
The end result of a slam-fire shotgun is that the shooter has full control over how many shots are fired without having to manually reload after each discharge. This is different from a semi-automatic shotgun where shooting multiple rounds is not possible unless you remove and replace the shell after every shot. A semi-automatic shotgun can be converted into a slam-fire configuration by simply removing the magazine (if applicable) and loading as many shells as will fit into the tubular magazine housing. Once all the shells have been loaded, insert the magazine back into the gun and release the trigger. The last bullet that was loaded will now be fired automatically without any additional manipulation from the shooter.
People who make their own firearms often like to customize them with added features.
Pyrotechnics are prohibited in some regions of California because flames started by fireworks cause significant injuries and millions of dollars in property damage each year. Keep in mind that pyrotechnics can ignite fires. If you set them off on someone's property or during firework displays, they could be the start of a large blaze.
Bottle rockets are just another type of rocket. They're made by filling a plastic bottle with an explosive mixture of gasoline and powder (usually sugar). The top is removed from the bottle and a wick inserted instead. When the wick is lit, it starts a flame which burns through the center of the bottom and lifts the mouth of the bottle up into a narrow pipe. As the gas inside the bottle expands, it pushes the mouth of the bottle down again, making a noise like a gunshot.
People sometimes use old car batteries as bottle rockets because they are lightweight and easy to find. However, these batteries can explode if damaged or exposed to excessive heat or force. Batteries should always be stored away from open flames, and never used as weaponary.
In addition to being dangerous, bottle rockets are also very expensive to replace. Any object that flies through the air must be treated with caution because it may contain ammunition.