Yes.
The answer is, it depends on where you are. In the United States, in most states, shotguns do not have to be registered, and for that matter, handguns, contrary to extremely popular, but patently incorrect belief, neither do handguns.
yes
Only if they meet certain criteria.
Shotguns can be purchased at a local gun shop or sporting goods store. Due to legal issues, shotguns must be purchased in person from a registered dealer.
Virginia does not have registration of ordinary rifles, shotguns or handguns- nor do most US states.
No. Like most of the US, there is no requirement to register ordinary rifles, shotguns, or handguns in KY.
Ordinary rifles, shotguns, and handguns, no. NFA regulated items are automatically registered upon purchase.
Depends on what registration process (if ANY) is used where you live. In MOST of the US, there is no registration of ordinary rifles, shotguns, or handguns.
No, only NFA regulated items such as machine guns, short barreled rifles/shotguns, etc.
NFA tax stamped short-barreled rifles/shotguns and full auto weapons are registered in the course of the licencing process. Normal Category I firearms (semi auto, bolt action, lever action, single shot, etc.) firearms are not, and, in most states, are not required to be registered.
Finding it is perfectly legal. POSSESSING one is a different matter, depending on just how "sawed off" it is. In the US, shotguns must have a barrel length of at least 18 inches, AND an overall length of 26 inches. Shotguns shorter than that are classed as "Short Barreled Shotguns" (abbreviated as SBS). If not registered with the Federal BATFE as a Class III firearm, possessing one is punished by 10 years in a Federal prison, a fine of $10,000. If not already registered, and the transfer tax of $200 paid, it CANNOT be registered, and must be surrendered to the BATFE for destruction. If it is longer than those dimensions, it does not violate the National Firearms Act.
There are three parts to the answer. 1. In most states in the U.S. there is no such thing as registration for regular guns (regular shotguns, rifles, or handguns). 2. If you live in one of the few states that requires registration, you generally go to the local police station, but it just depends on the state, but you don't just "become" a registered gun owner. You simply register the gun when you purchase it. 3. If you are talking about class 3 items (silencers, short shotguns, etc), those items are registered federally. You process the paperwork for those when you purchase them also.
You would have to define "tactical rifle". In most of the US, no license is required for rifles or shotguns. Full auto firearms must be registered with the US BATFE.