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|Subject/Law||Long guns||Handguns||Relevant Statutes||Notes|
|Constitutional Right to Bear Arms||Yes||1:25||"The people have the right to keep and bear arms for security, defense, hunting, recreation or any other lawful purpose."|
|State Preemption of local restrictions?||Yes||Yes||66.0409|
|State Permit to Purchase?||No||No||175.35||48 hour waiting period on handguns|
|Concealed carry license issued?||No||Yes||175.60||Permit is given on a shall-issue basis. May carry openly without a license (except in taxpayer-owned buildings & school zones).|
|Open carry permitted?||Yes||Yes||Open carry of loaded handguns and long guns is permitted without a license. If carrying openly in a vehicle, it must be "visible to ordinary observation" in order not to be considered concealed (needing a license).|
|Castle Doctrine/Self Defense Statutes||Yes||895.62||Immunity from prosecution and civil damages in the home, with conditions and exceptions|
|939.48||No duty to retreat in the "dwelling" or owned/operated place of business. No deadly force solely to protect property. 3rd party protection. If attack is provoked, self defense may only be used if reasonable belief of imminent death or great bodily harm. If attack is provoked deadly force only allowed if all other reasonable means of avoidance exhausted.|
|940.01||"the state must prove beyond a reasonable doubt that the facts constituting the defense did not exist in order to sustain a finding of guilt"|
|"Assault weapon" law?||No||No||–|
|Owner license required?||No||No||941.29|
|NFA weapons restricted?||Machine Guns restricted, exceptions apply||941.298||Silencers, SBR, and SBS allowed if NFA rules followed, otherwise felony|
The Constitution of Wisconsin protects the right to bear arms in Article 1, Section 25 - "The people have the right to keep and bear arms for security, defense, hunting, recreation or any other lawful purpose."
Wisconsin has a state preemption law that generally forbids cities from passing firearms ordinances more strict than that of state law. Localities may impose a sales or use tax, and may restrict the discharge of firearms (except for self-defense).
WI statute 66.0409.
As of November 1, 2011, Wisconsin residents may apply for a concealed carry license through the Wisconsin Department of Justice. The law allows Wisconsin to become the 49th state in the Union to make some provision for the concealed carry of firearms by normal citizens.
WI statute 175.60  details obtaining a WI concealed carry license.
WI statute 941.23  covers concealed carry. (It is a crime unless the person meets certain exceptions, one of which is having a concealed carry license recognized by WI.)
Open carry is legal anywhere concealed carry is legal, is legal for all adults (18+) who are not prohibited from possession, and does not require a license unless the citizen is in a taxpayer-owned building or within 1000' from the edge of a school property (_and_ not on private property).
In the past, some jurisdictions have tried to prosecute open-carry by equating the open carry of handguns with disorderly conduct. On April 20, 2009 the Wisconsin Attorney General's office released a memorandum to all law enforcement agencies stating that mere open carry of a firearm was not disorderly conduct, and instructed both law enforcement and the district attorneys to cease this practice.
In 2011 a subsection was added to the Disorderly Conduct statute (947.01 ) reading "Unless other facts and circumstances that indicate a criminal or malicious intent on the part of the person apply, a person is not in violation of, and may not be charged with a violation of, this section for loading, carrying, or going armed with a firearm, without regard to whether the firearm is loaded or is concealed or openly carried." This codified open carry, ending any debate as to its legality.
Loading, or having a loaded, uncased handgun inside a vehicle was legalized beginning November 1, 2011. The firearm must not be "hidden from ordinary observation" while inside the vehicle unless the citizen has a license.
On December 7, 2011 Governor Walker signed a bill passing a Castle Doctrine for Wisconsin. The bill provides criminal immunity (WI statute 939.48(1m)) and protection from civil suits (WI statute 895.62 ) for homeowners or business owners who use a gun in self-defense while on their property, with the presumption that any action was justified. The law is a "stand your ground" law, which does not contain a duty to retreat. This applies in your car, at your business, and at your home. Protection extends to improvements only (driveway, sidewalk, patio, fence, garage, house...), not bare ground. Also, the criminal must have forcibly entered, or be in the process of attempting to forcibly enter, and the defender must be present in the home, car, or business. The Washington County DA ruled that opening a door counts as forcible entry.
The law does not apply if force is used against police while in the line of duty if the shooter knows or should have known that the victim was a police officer or other public safety worker (WI statute 895.62(4)(b)). The law also does not protect those who are engaged in criminal activity. (WI statute 939.48(1m)(b)(1))
Wisconsin is not a "must notify" state. If an officer is "acting in an official capacity and with lawful authority", and the citizen is doing something which requires a license (carrying concealed, or carrying in one of the protected areas), the citizen must show both a carry license and a driver's license upon demand.
WI statute 175.60(2g)(c)
Beginning November 1, 2011, it is legal to load a handgun, or to transport a loaded handgun cased or uncased, in a vehicle without a license. NOTE: This does NOT apply to long guns; they still must be unloaded, but now may be uncased. There is still some confusion as to whether or not an encased gun is concealed, so if it is cased, best practice is to keep the long gun out of reach. Long guns must be "discernable to ordinary observation", since a conceal carry license does not apply. Previously all firearms had to be unloaded & encased (per the transport statute), & out of reach (derived from the concealed carry statute). Those with a concealed carry license may conceal a pistol in a vehicle.
WI statute 167.31
Pistols may be carried openly without a license, concealed with one. Long guns must be unloaded while the motor is running; they are not required to be encased, but must be in plain sight.
Firearms are prohibited on commercial aircraft except in checked baggage. A discussion of federal laws is in this  blog post, with links to and quotes from the statutes.
Carry is legal on a private aircraft. With a license one may carry openly or concealed. Without a license, only open carry is legal.
Anyone on their own property, on-duty law enforcement officers, military personnel on active duty, landowners and their family and employees on farm tractors inside CWD eradication zones, and disabled hunters with special permits meeting all the requirements.
Private sales are legal. No background check or governmental permission / registration are necessary. A sales receipt is recommended in case the buyer needs to prove ownership (as when retrieving firearms which have been confiscated by police).
There is a 48-hour waiting period on handgun purchases from an FFL (does not apply to private sales).
WI statute 175.35 
Rifles and shotguns can be purchased in a contiguous state as long as the purchase complies with Federal law and the laws of both states.
WI statute 175.30 
Machine guns are legal if the firearm is registered with the Bureau of Alcohol, Tobacco, Firearms & Explosives (BATFE), AND the owner has received permission from the local sheriff or chief of police (941.26), or the weapon is exempted per statute 941.27.
Short-barrel rifles and shotguns are legal if they are registered with ATF, state statute 941.28
Silencers are legal if they are registered with ATF, statute 941.298
Statute 29.091 and 29.089 used to require firearms to be encased and unloaded in state wildlife refuges and fish hatcheries. Those who have a concealed carry permit were not subject to these restrictions on handguns.
As of 01JAN13, anyone who is legal to possess a firearm may openly carry a pistol in a state park without a license. (The law used to say that to possess in a state park, one must be a licensee. That law was removed.) The restriction still applies to fish hatcheries & long guns, and in order to enter a taxpayer-owned building anywhere (including a park) one must be a licensee.
Possession of a firearm while intoxicated (0.08% BAC or "materially impaired"), shooting within 100 yards of a home without permission, pointing a weapon at anyone except in self-defense, and negligent handling of a weapon are all crimes.
Carrying a concealed weapon without a valid license is a class A misdemeanor. This is any "weapon", not just firearms. This restriction does not apply in your one's own home or business. A concealed carry license only covers handguns, tazers, billy clubs, and knives which are not switchblades.
WI statute 941.23
Carrying a handgun without a concealed carry license where alcohol is sold AND consumed (the class B establishment - a "tavern", a place which sells alcohol for on-premises consumption) is generally a class A misdemeanor.
Exceptions are having a license, and that the owner or manager of can give permission for someone (without a license) to carry openly. When carrying (openly or concealed) on a license, alcohol may not be consumed on the premises. When carrying openly with permission of the owner or manager, it is legal to consume alcohol as long as you do not become "materially impaired". This is generally understood to be 0.08%BAC, but there is no case law, so someone could be convicted at a much lower BAC. It is legal to carry a handgun into a store that sells alcohol for the express purpose of being consumed elsewhere (a liquor or grocery store).
WI statute 941.237
Armor-piercing ammunition when committing a crime upgrades the crime to a Class H felony.
WI statute 941.296 
"No person may carry or display a facsimile firearm in a manner that could reasonably be expected to alarm, intimidate, threaten or terrify another person", unless on your own property or business, or that of another person with their consent.
WI statute 941.2965 
Committing a crime while possessing a dangerous weapon is a penalty enhancer.
WI statute 939.63 
It is a felony to possess a firearm or ammunition if one:
Any person who knowingly provides a firearm to a prohibited person is party to a felony crime.
It is a class I felony to possess a firearm on school grounds.
This statute does not apply to:
It is a forfeiture (fine) to possess a usable firearm on public property within 1000 feet of a school unless the carrier is a licensee. (If the gun is unloaded & encased, it is not a crime.) Wisconsin only issues resident licenses, and the ATF has interpreted federal law to mean that only licenses issued by the state in which the school is located are sufficient to void the "gun-free" school zone.
It is a class G felony to discharge or attempt to discharge a firearm in a school zone. Exceptions for self-defense, private property not part of school grounds, school programs, and on-duty law enforcement.
Leaving a firearm within reach of a child under 14 is generally a misdemeanor, if that child points it at anyone, harms anyone, or shows it to anyone in a public place. Defenses include having the gun locked in a safe or container, having it holstered on your person, having a trigger lock on the gun, removal of a key operating part, illegal entry by anyone to obtain the firearm, or a reasonable belief a juvenile couldn't access the firearm.
WI statute 948.55
Firearms retailers are required to provide every buyer with a written warning stating, "If you leave a loaded firearm within the reach or easy access of a child, you may be fined or imprisoned or both if the child improperly discharges, possesses or exhibits the firearm."
WI statute 175.37
Possession of a dangerous weapon by anyone under 18 is a class A misdemeanor. Giving/loaning/selling a dangerous weapon to someone under 18 is a class I felony.
WI statute 948.60
Defenses to prosecution under this statute:
For hunting purposes, the following exceptions to the age limit apply, as specified in statute 29.304 for firearms with barrels 12" or longer.
School students shall be suspended until their expulsion hearing if they possess a firearm in school or during a school event (except if the student is participating in a Hunter Safety class). State law requires a minimum one-year expulsion for this offense. Statute 120.13(1)(bm) and 120.13(1)(c)2m. In addition, the student's driver's license may be suspended for two years under Statute 938.34(14q). This suspension also applies to students who make bomb threats or have CCW violations in taxpayer-owned buildings.
“School” means a public, parochial or private school which provides an educational program for one or more grades between grades 1 and 12 and which is commonly known as an elementary school, middle school, junior high school, senior high school or high school.
“School zone” means any of the following: 1. In or on the grounds of a school. 2. Within 1000' from the grounds of a school.
WI statute 948.605(1)(c)
Any individual who knowingly possesses a firearm at a place that the individual knows, or has reasonable cause to believe, is in or on the grounds of a school is guilty of a Class I felony unless one of the exemptions applies.
WI statute 948.605(2)(a)
Possession in the 1000' zone is a forfeiture (ticket), unless an exception applies. The most common of those are: private property, licensee, unloaded & encased.