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Missouri 80 Percent Lower Laws

80 Percent Arms   |   Jan 10th 2022

Disclaimer: To get started, we want to share a small disclaimer. We are dedicated and proud supporters of everything 2nd amendment, but we are not lawyers. So, before you take what you read here and run with it, you will want to double-check all of your local or state gun laws. Make sure you are up to date on any special regulations that may apply to you and your situation. Gun laws are always changing and always do your part to stay up to date with the newest and current laws.

This information is provided as a service to the public. It is NOT intended to be taken as legal advice and should never be considered as such. Make sure to do your own research as you and you alone are responsible for your own actions.

This is a developing list of information we intend to update regularly to stay accurate and current. If you see a discrepancy or a mistake with your home state’s laws that we’ve covered, feel free to let us know so we can correct it. Thank you and stay safe!

What is an 80% Lower?

An 80% lower receiver is an unfinished and unserialized blank which requires some machining work from the end user to turn it into a 100% lower receiver, otherwise, what is legally considered as a firearm. 80 lowers are missing the trigger pocket and a three holes that need to be milled and drilled out to be completed. Unless states have passed their own laws barring the possession or sales of 80% products; pending the ATF's updated decision from the most recent proposed rule 2021R-05 80% lowers are completely legal, not considered firearms and thus can be shipped straight to your front door. No FFL required. To explore the 80% lower receiver products we have to offer, check out our multiple collections.

Are 80 Lowers Legal In Missouri?

As of this guide’s initial publish date, 80% lower receivers and frames are not considered as firearms by the ATF and are legal to ship directly to buyers residing in the state of Missouri.

Do I Need to Serialize My 80 Lower in Missouri?

If you build out your own firearms starting with 80 lowers in Missouri you do not need to serialize the lower receiver or frame as there are currently no laws requiring citizens to do so. Should you wish to serialize your lower receiver we offer  custom engraving for our lowers.

Key Gun Laws in Missouri

Other than laws regarding 80 lowers, these are the key gun laws you should be aware of if you reside or are traveling through Missouri.

Firearm Possession and Purchase Requirements

It seems worthy to mention at this point that for states with more less gun control restrictions and stronger gun culture they specifically enforce that it is illegal to “recklessly” sell, lease, loan, give away or deliver any firearm to a person under the age of 18 without the child’s parental or legal guardian's consent. This is true for the state of Missouri as well.

To purchase a handgun in Missouri, buyers must be legally eligible and at least 21 years of age. Long buyers need only be 18 years old and of course in good legal standing. When it comes to minors in possession of firearms, there is technically no minimum age to possess rifles or shotguns for minors as long as they are being accompanied or supervised by a parent or legal guardian. Exceptions for minors in possession of firearms also includes when attending a hunter’s or firearms safety course, using the gun for target practice or recreational shooting at an established range, involved in an organized competition, hunting or trapping with a valid license, travelling to and from these events, or at their own residence with permission and supervision of a parents or a legal guardian.

Firearm purchases require a background check not including private party transfers (Dealer Record of Sale also known as 4473 form or “DROS”). While federal law requires federal firearm license holders (“FFL’s”:) to initiate background checks on buyers prior to the sale of a firearm, federal law also allows states to serve as their own “point of contact” and conduct their own background checks via state, federal records or databases, as well as the option to use the FBI’s National Instant Criminal Background Check System (“NICS”) database. Missouri is not a point of contact for the NICS and as a result, dealers must conduct their background checks by going to the FBI’s NICS directly.

Open and Concealed Carrying

Missouri is a permitless carry and also a “shall-issue” state. Permits are issued for reciprocity purposes which is helpful for resident when traveling out of state. Open and carry concealed carry are legal in Missouri with a ccw in the form of a “CCP” or Concealed Carry Permit. Applicants must be at least 19 years of age or 18 if they’re in the military. Since permitless carry is legal, anyone legally allowed to possess a firearm and 19 years of age or older can carry a concealed firearm on their person without a permit.

NFA Restrictions

Missouri does not restrict assault weapons nor do they have a magazine capacity restriction.

Magazine Capacity Restrictions

There are, of course, no magazine capacity bans in Missouri. Enjoy those drums and belt-fed box magazines while you can! We carry plenty of standard capacity magazines like the  Lancer Advanced Warfighter magazines which we have in 30 rounder options. Our favorite color is the translucent smoke one.

Mandatory Storage Requirements

There are no mandatory safe storage requirements for firearms in Missouri but if your carelessness causes the harm or death of a child you will be liable and held responsible. If you need some good ideas or best practices for storing your guns and gear here are some great storage options.


Missouri is a castle doctrine state and has a stand your ground law which means that homeowners need not retreat before using lethal force in response to a threat within their own home for the sake of self-defense. In the same regard, if an individual believes that deadly force is necessary to defend themselves or others to prevent death, serious injury or forcible felony then that deadly force is justifiable.

Ammunition Purchase

Virtually every type of ammunition is legal and unrestricted in the state of Missouri. However, ammo cannot be unlawfully given to minors. Otherwise, Missouri does not require a license for the sale, purchase or possession of ammunition. Sellers are also not required to maintain a sales record. Federal laws apply so buyers must be 21 years of age to buy handgun ammo and 18 years old to buy any long gun ammo. All bulk ammo orders online require buyers to be 21 years of age.

Start Your Next 80 Lower Build with 80% Arms!

Missouri residents are completely free to build their own firearms from 80 lowers and frames without any required serialization or FFL transactions. It's the perfect state to take advantage of your constitutional Second Amendment right and freedom to keep and bear arms. That includes 80% Arms! Grab our  patented lower jig and some buddies to enjoy that freedom together and let us know if you need any advice with your build at any point in the process. Friends, live free.