What Is CALCRIM 2510? Elements, Defenses, and Penalties

CALCRIM 2510 is the California jury instruction that tells jurors what the prosecution has to prove in a felon-in-possession case, or any case charging a prohibited person with possessing a firearm. The jury must find three things beyond a reasonable doubt: the defendant possessed a firearm, the defendant knew they possessed it, and the defendant had a prior conviction that legally barred them from having one.¹ The instruction is often confused with CALCRIM 2670, which is a separate instruction on whether a peace officer was lawfully performing their duties.²

Which Charges Use This Instruction

CALCRIM 2510 is built around California Penal Code Section 29800, which makes it a felony for anyone convicted of a felony to possess a firearm. It does not matter where the original conviction happened: California, another state, federal court, or a foreign court all count.³ The same statute also bars anyone addicted to a narcotic drug from possessing a firearm, even with no felony record.

The instruction reaches further than felonies. Penal Code 29805 bars firearm possession for 10 years after conviction for dozens of specific misdemeanors, including assault, battery, domestic violence, stalking, and brandishing a weapon.⁴ CALCRIM 2510 covers charges under both sections, so a jury can hear this instruction in a case against a prohibited misdemeanant just as readily as in a case against a convicted felon.

What Qualifies as a Firearm

California Penal Code 16520 defines a firearm as a device designed to be used as a weapon that expels a projectile through a barrel by the force of an explosion or other combustion.⁵ Pistols, revolvers, rifles, and shotguns all qualify. The weapon does not need to be loaded or even in working order; if it was designed to shoot and appears capable of shooting, it counts.¹

For purposes of the prohibited-person statutes (Sections 29800 through 29905), the definition also includes the frame or receiver of a weapon and even a firearm precursor part.⁵ Possession of just a lower receiver, with no other components attached, can support a charge.

Antique Firearms Are Not Exempt in California

Federal law excludes antique firearms from its definition of “firearm,” and the federal prohibited-person statute generally does not reach them. California does not follow that rule. Penal Code 16520(d) identifies the specific statutes in which an unloaded antique firearm does not count as a firearm, and Sections 29800 through 29905 are not among them.⁵ A convicted felon in California caught with a Civil War-era revolver faces the same charge as one caught with a modern handgun.

How Possession Is Proven

Possession is almost always the most contested element at trial. Under CALCRIM 2510, possession does not require the defendant to be holding or touching the weapon. It is enough that the defendant had control over it or the right to control it, personally or through another person.¹ The instruction recognizes three forms.

Actual Possession

Actual possession means the firearm is physically on the defendant’s person or within immediate reach: in a jacket pocket, a worn backpack, or a waistband. The physical connection is obvious, and these cases are the easiest for the prosecution.

Constructive Possession

Constructive possession is harder. The prosecution argues the defendant controlled the place where the firearm was found, even if the defendant was not there when officers found it. A firearm in a bedroom closet or a car trunk can support this theory when the prosecution ties the defendant to that space with ownership documents, fingerprints, or personal belongings near the weapon.

The theory gets genuinely difficult when a home or vehicle is shared. Simply being present where a firearm turns up is not enough. If several people can access the space, the prosecution needs something more specific: DNA, witness testimony, text messages discussing the weapon, or similar evidence tying the defendant personally to the gun. This is where these cases most often fall apart.

Joint Possession

Two or more people can possess the same firearm at the same time.¹ If a husband and wife both have access to and control over a gun kept in their shared bedroom, both can be charged, even though only one weapon exists.

What “Knowledge” Means Under CALCRIM 2510

The knowledge element is narrower than most people assume. The prosecution has to prove the defendant knew they possessed the firearm: that they were aware of its presence and had control over it.¹ That is all.

The prosecution does not have to show the defendant knew the object met the legal definition of a firearm. And the prosecution does not have to prove the defendant knew they were legally prohibited from having one. Someone who genuinely believed their felony record was expunged, or that their rights had been restored, can still be convicted if they knowingly possessed the firearm and in fact had a disqualifying conviction.

How the Jury Hears About the Prior Conviction

Courts handle the prior conviction with care to avoid unfair prejudice. The jury is told only that the defendant has a prior conviction that legally prohibits firearm possession. The specific offense, whether fraud, drug trafficking, or robbery, is kept from the jury.¹ The instruction warns jurors they may consider the prior only for deciding whether that element has been proved, and for no other purpose.

The reason is practical. If jurors learned the defendant had a prior armed robbery conviction, some might assume the defendant is the type of person who would possess a gun, instead of weighing the actual evidence of current possession. The proof itself usually arrives through certified copies of court records from the earlier case.

Penalties

A conviction under Penal Code 29800 is a felony. The sentencing triad is 16 months, two years, or three years.⁶ Most sentences are served in county jail under California’s realignment framework rather than state prison. If the defendant has a prior serious or violent felony or must register as a sex offender, the sentence is served in state prison instead. The court can also impose fines of up to $10,000. A new felony conviction also resets the clock on the firearm prohibition.

Defenses to a CALCRIM 2510 Charge

Defense attorneys in these cases work with a limited toolkit. The strongest defenses attack the elements the prosecution must prove. A few affirmative defenses exist, but they are hard to win.

Lack of Knowledge or Possession

The most direct defense is that the defendant did not know the firearm was there. If someone borrows your car and leaves a gun under the seat without telling you, the knowledge element fails. If a firearm turns up in a common area of a shared home and nothing links it to the defendant specifically, the possession element may fail. Challenging constructive possession in shared living situations is where defense attorneys do their best work.

Momentary or Transitory Possession

California recognizes an affirmative defense of momentary possession. The defendant admits they had the firearm but argues they held it only briefly, solely to get rid of it. CALCRIM 2510 lists three requirements the defendant must prove by a preponderance of the evidence:

The possession lasted only a momentary or transitory period.
The defendant possessed the firearm to abandon, dispose of, or destroy it.
The defendant did not intend to prevent law enforcement from seizing the weapon.

The burden shifts to the defendant, though the standard is lower than beyond a reasonable doubt; the defendant only has to show each point is more likely true than not.¹ In practice this works best when the defendant took the gun from someone dangerous and immediately turned it over to police or abandoned it.

Necessity

Courts read the necessity defense narrowly, and it succeeds only in rare situations. The defendant must show they picked up the firearm in response to a genuine, immediate threat, had no other realistic option, got rid of the weapon as soon as the danger passed, and did not try to hide what happened from law enforcement. A defendant who disarms an attacker and immediately hands the weapon to responding officers has a plausible claim. A defendant who disarms someone and keeps the gun at home for a week does not.

Why a “Clean Record” Often Does Not Restore Gun Rights

People routinely get charged under CALCRIM 2510 because they assumed some form of post-conviction relief had restored their firearm rights. Most forms have not.

Dismissal under Penal Code 1203.4, commonly called expungement, does not restore the right to possess firearms. The statute says so explicitly.⁷ A Proposition 47 reduction of a felony to a misdemeanor does not restore firearm rights either; Penal Code 1170.18(k) provides that the reduction does not permit the person to possess a firearm. A Certificate of Rehabilitation does not by itself restore firearm rights, though it serves as an automatic application for a Governor’s pardon.⁸

Two paths can actually restore rights. For a “wobbler” offense, a reduction to a misdemeanor under Penal Code 17(b) may restore California firearm rights, though federal law may still prohibit possession. A full and unconditional pardon from the Governor is the most reliable path. For certain particularly serious offenses, the pardon also requires approval from the California Supreme Court.

1
Justia. CALCRIM No. 2510 – Possession of Firearm by Person Prohibited Due to Conviction
2
Justia. CALCRIM No. 2670 – Lawful Performance: Peace Officer
3
California Legislative Information. California Code PEN 29800 – Prohibitions on Firearm Access
4
California Legislative Information. California Penal Code 29805
5
California Legislative Information. California Code PEN 16520
6
California Legislative Information. California Penal Code 1170(h)
7
California Legislative Information. California Penal Code 1203.4
8
California Courts. Certificate of Rehabilitation