Under Arizona’s criminal code, the deadly weapon definition is anything designed for lethal use, and the term expressly includes every firearm. That short phrase does a lot of work. If an object’s engineered purpose is to kill, it qualifies, and the classification matters because any felony committed with a deadly weapon becomes a “dangerous offense” that carries roughly double the prison time of the same crime without one, with no option for probation.
What the Statute Actually Says
Arizona Revised Statutes 13-105 defines a deadly weapon as anything that is designed for lethal use, and the definition specifies that firearms are included.1Arizona Legislature. Arizona Code 13-105 – Definitions Every handgun, rifle, and shotgun fits, because each was built to fire a projectile capable of killing. Whether the gun is loaded, unloaded, holstered, or locked in a case at the moment of the offense makes no legal difference.
The definition reaches past firearms to any object whose maker built it to inflict lethal harm. Fixed-blade fighting knives, swords, and purpose-built impact weapons fall inside the line. The test is the object’s design, not how it was handled on a particular day.2Arizona Legislature. Arizona Code 13-3101 – Definitions A dagger in a drawer is still a deadly weapon in Arizona because no one designed it to butter toast. Courts look at the physical characteristics and the manufactured purpose of the item rather than the facts of any single incident.
Dangerous Instruments: The Second Category You Need to Know
Arizona treats a second class of objects as the legal equivalent of weapons for sentencing purposes, and anyone trying to understand the deadly weapon rule needs to understand this parallel category. A “dangerous instrument” is not defined by what the object is. It is defined by what someone does with it. The statute covers anything that, under the circumstances in which it is used, attempted to be used, or threatened to be used, is readily capable of causing death or serious physical injury.1Arizona Legislature. Arizona Code 13-105 – Definitions
A car is the standard example. Driven normally, it is transportation. Driven deliberately into a person, it becomes a dangerous instrument carrying the same consequences as a firearm. The same logic applies to a baseball bat, a heavy wrench, a broken bottle, or anything else wielded in a way that creates a real risk of killing or seriously injuring someone. Prosecutors do not have to prove the object was built for violence. They have to prove the way it was used made it capable of lethal or serious harm.
The practical consequence is wide reach. Almost any assault case can be charged as a “dangerous” offense if the instrument used posed a genuine threat of death or serious physical injury. That single charging decision changes the sentencing math completely.
Why the Classification Matters: Dangerous Offense Sentencing
When a felony is classified as a dangerous offense because it involved a deadly weapon or dangerous instrument, the sentencing range roughly doubles compared to the same felony without a weapon, and probation is unavailable. For a first dangerous offense, the court must impose a prison term within these ranges:3Arizona Legislature. Arizona Code 13-704 – Dangerous Offenders; Sentencing
- Class 2 felony: 7 to 21 years, presumptive 10.5 years
- Class 3 felony: 5 to 15 years, presumptive 7.5 years
- Class 4 felony: 4 to 8 years, presumptive 6 years
- Class 5 felony: 2 to 4 years, presumptive 3 years
- Class 6 felony: 1.5 to 3 years, presumptive 2.25 years
Set those figures next to non-dangerous first-offense sentencing. A class 4 felony without a dangerous allegation carries a presumptive 2.5 years with a range of 1.5 to 3.75 years.4Arizona Legislature. Arizona Code 13-702 – First Time Felony Offenders; Sentencing; Definition The same conduct charged as dangerous jumps to a presumptive 6 years with a floor of 4. That is not a marginal increase.
Prior dangerous convictions push the numbers higher. A class 4 dangerous felony with one prior dangerous felony conviction runs 8 to 12 years. With two or more prior dangerous felonies, the range is 12 to 16 years.3Arizona Legislature. Arizona Code 13-704 – Dangerous Offenders; Sentencing A class 2 felony with two or more prior dangerous convictions reaches a ceiling of 35 years. These sentences are mandatory prison. No probation. No suspended sentence.
When Use of a Deadly Weapon Is Legally Justified
Arizona is a stand-your-ground state. You have no duty to retreat before using deadly force so long as you are somewhere you have a legal right to be and you are not engaged in an unlawful act. Beyond that threshold, the law recognizes two main justifications.5Arizona Legislature. Arizona Code 13-405 – Justification; Use of Deadly Physical Force
Self-Defense
You can threaten or use deadly force when a reasonable person in your situation would believe it is immediately necessary to protect against another person’s use or attempted use of unlawful deadly force. Both halves count. The threat has to be happening in the moment, not five minutes earlier and not maybe tomorrow, and a reasonable person standing where you stood would have reached the same conclusion.
Crime Prevention
Arizona also allows deadly force to prevent certain serious crimes even if you are not personally under attack. The list includes arson of an occupied structure, burglary, kidnapping, murder, manslaughter, sexual assault, sexual conduct with a minor, child molestation, armed robbery, and aggravated assault involving physical injury or a deadly weapon.6Arizona Legislature. Arizona Revised Statutes 13-411 – Justification; Use of Force in Crime Prevention There is no duty to retreat in these situations, and the statute creates a presumption that you acted reasonably when the circumstances involved one of the listed crimes. That presumption shifts the burden to prosecutors to prove your belief was unreasonable.
These protections apply in your home, your business, your vehicle, land you own or lease, and any other place in Arizona you have a legal right to be. The operative word throughout is “reasonably.” A self-defense claim collapses quickly when the force used was wildly disproportionate to the actual threat, or when the person claiming self-defense started the confrontation.
The Long-Term Consequence of a Dangerous Offense Conviction
A dangerous offense conviction carries a consequence that outlasts the prison sentence. Arizona lets most people with felony convictions petition a court to restore their right to possess a firearm after completing their sentence, but the statute draws a firm line around dangerous offenses: anyone convicted of a dangerous offense can never petition. The ban is permanent.7Arizona Legislature. Arizona Code 13-910 – Restoration of Right to Possess a Firearm
Because any felony committed with a deadly weapon or a dangerous instrument qualifies as a dangerous offense, a single weapons-related conviction eliminates firearm rights for life under Arizona law, with no path to restoration. The definition that opened this article (anything designed for lethal use, firearms included, plus any object used in a way readily capable of causing death or serious injury) is the same definition that controls whether a conviction will follow you forever.