There is no waiting period to buy a gun in Missouri. State law doesn’t impose one, and no Missouri city or county is allowed to create one either. Once you pass the federal background check at a licensed dealer — a process that usually finishes in minutes — the dealer can hand you the firearm the same day.
What Happens at the Counter
When you buy from a federally licensed dealer in Missouri, you fill out ATF Form 4473 and the dealer runs your information through the National Instant Criminal Background Check System (NICS). NICS returns one of three answers: proceed, denied, or delayed. A “proceed” closes the sale on the spot. A “denied” stops it. A “delayed” means the FBI needs more time to look at something in your records.1Federal Bureau of Investigation. About NICS
Most buyers get an immediate “proceed” and walk out with the gun that day. If the check comes back delayed, federal law gives the FBI three business days to resolve it. After that window, the dealer is legally allowed to complete the sale even without a definitive answer. This is the “default proceed” rule.2Office of the Law Revision Counsel. 18 USC 922 – Unlawful Acts Dealers aren’t required to proceed at that point — some prefer to wait for a clear answer — but they have the option. This three-day window is the closest thing to a waiting period a typical Missouri buyer will ever encounter, and most never hit it.
The One Real Delay: Buyers Under 21
If you are between 18 and 20 years old, your background check works differently and can take longer. The Bipartisan Safer Communities Act, signed in 2022, requires NICS examiners to go beyond the standard database queries for buyers under 21. They contact state juvenile justice agencies, mental health authorities, and local law enforcement to look for records that don’t appear in national databases.3Federal Bureau of Investigation. NICS Enhanced Background Checks for Under-21 Gun Buyers Showing Results
The initial window is the same three business days that apply to everyone. If nothing concerning turns up in that time, the sale moves forward. But if examiners find reason to investigate a potentially disqualifying juvenile record, the law extends the window to 10 business days.2Office of the Law Revision Counsel. 18 USC 922 – Unlawful Acts Only after those 10 business days pass without a denial can the dealer complete the transfer. For a younger buyer with any juvenile history, that effectively creates a wait of up to two weeks in a state that otherwise has none.
Keep in mind the separate age rule for what you can buy at a dealer: 18 for a rifle or shotgun, 21 for a handgun.4Bureau of Alcohol, Tobacco, Firearms and Explosives. Minimum Age for Gun Sales and Transfers Missouri doesn’t add anything on top of those federal minimums.
Why No Missouri City or County Can Add a Waiting Period
Missouri’s firearms preemption law reserves all firearms regulation to the state legislature and strips cities, counties, and other local governments of authority to pass their own gun ordinances.5Missouri Revisor of Statutes. Missouri Revised Statutes 21.750 – Firearms Legislation Preemption by General Assembly That includes any local waiting period or purchase-delay rule. The same statute also bars local governments from creating a registry of firearm transfers or ownership. So the answer doesn’t change if you buy in St. Louis, Kansas City, Springfield, or a small county seat — the timing rules are the same everywhere in the state.
Federal law doesn’t fill the gap. The original Brady Handgun Violence Prevention Act once imposed a five-day waiting period on handgun purchases from licensed dealers, but that requirement expired in 1998 when NICS went live. No federal waiting period has existed for any firearm type since then. The decision falls entirely to each state, and Missouri has chosen not to impose one.
Private Sales Between Missouri Residents
Buying from someone who isn’t a licensed dealer is faster still, because no background check is involved. Missouri does not require a NICS check, paperwork filing, or any state recording for a sale between private individuals who both live in Missouri. There’s no state requirement for a bill of sale, though keeping one is a sensible liability precaution.
Faster doesn’t mean lawless. Federal law makes it a crime to sell a firearm to someone you know or have reason to believe is prohibited from possessing one.2Office of the Law Revision Counsel. 18 USC 922 – Unlawful Acts Missouri law reinforces this by criminalizing transfers of concealable firearms that violate the relevant sections of federal law.6Missouri Revisor of Statutes. Missouri Revised Statutes 571.080 – Transfer of a Concealable Firearm Ignoring obvious red flags doesn’t earn a pass just because no check was required.
One hard limit on private sales applies no matter how quickly both sides want to move: both the buyer and the seller must live in the same state. Federal law prohibits unlicensed individuals from transferring firearms to a resident of a different state. If you and the seller live in different states, the firearm has to be shipped to a licensed dealer in your home state, where you then complete a Form 4473 and background check before taking possession.2Office of the Law Revision Counsel. 18 USC 922 – Unlawful Acts In that scenario, the dealer-sale timing rules take over, including the three-business-day delayed-check window.
What the Timing Looks Like in Practice
For most Missouri buyers over 21 with a clean record, the whole process at a dealer takes as long as it takes to fill out the paperwork and wait for the phone call. Walk in, fill out Form 4473, wait a few minutes for the NICS response, and leave with the firearm. If NICS delays the check, expect a wait of up to three business days before the dealer can proceed under the default rule — if they choose to. If you’re under 21 and the enhanced check flags a juvenile record for review, plan for up to 10 business days. In a private sale between two Missouri residents, there’s no check and no built-in wait at all. Beyond those scenarios, Missouri simply doesn’t make you wait to buy a gun.