Is the AR-15 legal in Missouri?

Yes. Missouri does not have an assault weapon ban. Standard AR-15 rifles are legal to own, purchase, and build.

Does Missouri require a permit to buy a firearm?

No. Missouri does not require a state-level permit or license to purchase a firearm. Federal background-check requirements still apply at licensed dealers.

Can I conceal carry in Missouri?

Missouri concealed carry status: Permitless (19+). No permit is required for residents who can legally own a firearm.

Is open carry legal in Missouri?

Missouri open carry: Yes (locality restrictions possible). Local restrictions may still apply in cities, parks, schools, or government buildings.

Does Missouri require background checks for private sales?

No. Missouri does not require background checks for private (non-dealer) firearm transfers, though federal law still requires checks for all licensed-dealer sales.

All States

English

Missouri Gun Laws

permissive

Firearm Regulations

Assault Weapon Ban

Mag Capacity Limit

Permit to Purchase

Firearm Registration

Concealed Carry

Permitless (19+)

Open Carry

Yes (locality restrictions possible)

Red Flag Law

Background Check (Private)

NFA Weapons

Unrestricted

State Preemption

Partial

Key Notes

Permitless carry since January 2017. Local governments can regulate open carry. St. Louis bans firearms in city parks.

•Permitless (19+) — Adults 19 and older can carry concealed without a permit since January 2017. Missouri uses an unusual 19+ age threshold.
•Yes (locality restrictions possible) Open Carry — Open carry is legal statewide, but local governments retain the ability to restrict open carry. St. Louis bans firearms in city parks.
•Partial (State Preemption) — Missouri has partial preemption. The state preempts most firearms laws, but localities can regulate open carry and certain aspects of possession on government property.
•Unrestricted (NFA) — All NFA items (SBRs, SBS, suppressors, machine guns, destructive devices) are legal under state law. Federally, ATF announced on October 9, 2026 that it would stop enforcing the National Firearms Act's approval, registration and tax stamp requirements for suppressors, short barreled rifles, short barreled shotguns and any other weapons (AOWs). This is an enforcement policy, not a change to the National Firearms Act; the law is still on the books and the policy can be reversed or challenged. Machine guns and destructive devices still need ATF approval.
•Carry Permits Available — While not required, Missouri still issues concealed carry permits for reciprocity with other states.

Last updated October 10, 2026

How Missouri Law Affects Your Build

Plain-English implications for builders, derived from the regulations above.

Standard AR-15 Configurations Allowed

Missouri does not restrict semi-automatic rifles by feature. Standard AR-15 configurations — including pistol grips, collapsible stocks, threaded barrels, and flash hiders — are legal for sale and ownership.

No Magazine Capacity Limit

Standard 30-round AR-15 magazines (and larger drums) are legal for sale and use in Missouri.

NFA Items Permitted

Missouri allows ownership of NFA items under state law, including suppressors, short-barreled rifles (SBRs), and short-barreled shotguns (SBS); machine guns still need an approved ATF transfer. ATF announced on October 9, 2026 that it would stop enforcing the National Firearms Act's approval, registration and tax stamp requirements for suppressors, short barreled rifles, short barreled shotguns and any other weapons (AOWs). This is an enforcement policy, not a change to the National Firearms Act; the law is still on the books and the policy can be reversed or challenged. Some states only allow suppressors and SBRs that are federally registered or possessed in compliance with federal law. Check your state's statute before you buy.

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Missouri Gun Laws — Frequently Asked Questions

Is the AR-15 legal in Missouri?: Yes. Missouri does not have an assault weapon ban. Standard AR-15 rifles are legal to own, purchase, and build.
What is the magazine capacity limit in Missouri?: Missouri has no magazine capacity limit. Standard 30-round AR-15 magazines and larger capacities are legal.
Does Missouri require a permit to buy a firearm?: No. Missouri does not require a state-level permit or license to purchase a firearm. Federal background-check requirements still apply at licensed dealers.
Can I conceal carry in Missouri?: Missouri concealed carry status: Permitless (19+). No permit is required for residents who can legally own a firearm.
Is open carry legal in Missouri?: Missouri open carry: Yes (locality restrictions possible). Local restrictions may still apply in cities, parks, schools, or government buildings.
Are suppressors and SBRs legal in Missouri?: Yes. Missouri allows suppressors, short-barreled rifles (SBRs), and short-barreled shotguns under state law. Taking an SBR or SBS across state lines still needs an approved ATF Form 5320.20. ATF announced on October 9, 2026 that it would stop enforcing the National Firearms Act's approval, registration and tax stamp requirements for suppressors, short barreled rifles, short barreled shotguns and any other weapons (AOWs). This is an enforcement policy, not a change to the National Firearms Act; the law is still on the books and the policy can be reversed or challenged. Some states only allow suppressors and SBRs that are federally registered or possessed in compliance with federal law. Check your state's statute before you buy.
Does Missouri require background checks for private sales?: No. Missouri does not require background checks for private (non-dealer) firearm transfers, though federal law still requires checks for all licensed-dealer sales.

Sources & Further Reading

Verify current Missouri firearm law with these authoritative resources. Laws change — always confirm with primary sources before purchasing or carrying.

Giffords Law Center — comprehensive state-by-state firearm law summaries and policy analysis.
NRA-ILA State Gun Laws — state directory with statute references and recent legislative updates.
Everytown Research State Rankings — research-driven scoring and policy explanations across all 50 states.
ATF Firearms — federal regulations on NFA items, FFL transfers, and firearm classifications.

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Legal Disclaimer: This page is for informational and educational purposes only and does not constitute legal advice. Firearm laws change frequently and vary by jurisdiction. Always verify current regulations with official state sources, a qualified attorney, or local law enforcement before making purchasing or carrying decisions. GunPartPicker is not responsible for errors, omissions, or actions taken based on this information.