cc-settings-icon BUILD AT HOME
80% Arms sells AR-15 and .308 80% Lower Receivers, 80% Lower Jigs and other accessories which allow you to legally build a firearm at home in most states.
We utilize state of the art 5-axis CNC machines to mill all our .308 and AR-15 80 percent lower receivers to incredibly precise tolerances using premium billet aluminum.
We also offer our patented AR-15 and .308 Easy Jigs® which is the first 80% lower jig that makes it ridiculously easy for a non-machinist to finish their 80% lower in under 1 hour with no drill press required.
Products manufactured by 80% Arms carry a lifetime warranty against manufacturing defects. We will promptly replace or repair any product that we determine to be defective.

Custom Serialized 80% Lowers - AR9

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We now offer you the ability to order your 80% lower receiver with a custom serial number engraved into it. Our engraving fee is $29.99 per lower receiver, plus the regular cost of the 80% lower receiver. At this time there is a 1 week lead time for engravings to be processed.

Serial numbers are NOT required in some states. This engraving service is not for registering "assault weapons." 

We use a powerful laser to precision engrave text to a depth greater than 0.003 inches as required by ATF's specification for serial number marking. To meet ATF serial number requirements, the following information must appear:

  • Serial Number: Enter your desired serial number in this box. We recommend using less than 12 characters of text. You can use letters, numbers, or combination of both. ATF requires serial numbers to be unique for each firearm you serialize. Every serial number engraving will start with S/N: 
  • Caliber: We will mark your receiver with “Cal: Multi” as shown in photos.
  • Manufacturer’s Name: Enter the name of the person who will complete the lower. Maximum of 30 characters of text including spaces. We may have to split it into two lines of text if you exceed 14 characters. We highly recommend using your real full first and last name.
  • Manufacturer’s City and State: Enter the city and state of residence for the person who will complete the lower. Use a 2 letter state abbreviation. Maximum 30 characters of text including spaces and commas. Anything exceeding 14 characters long may be split into two lines of text.
  • Model Number: A model number is not required to be engraved except if you will be registering your rifle as an “assault weapon” with certain states' DOJ such as California. 

    Please verify the information you supply to us is correct before submitting your order. Custom serialized 80% lower receivers are not returnable, and orders cannot be canceled once engraving has begun.

Please double check you do not have any typos. 

Experience unparalleled quality with our lifetime warranty against manufacturing defects on our lower receivers so you can build with confidence. Secure yours today and enjoy the satisfaction of creating your own 80 lower receiver. No FFL is required. Just keep in mind that federal, state, and local laws may apply.

For more help and tips, be sure to check out our instructional videos HERE.

If you need an extra Bolt Catch Screw - Buy the Kit here

Our lifetime warranty will cover the receiver against any manufacturing defects. All 80% lowers will be engraved with Capital letters.  

Shipping Restrictions:

This item is restricted from shipping to California, Connecticut, New Jersey, New York, Washington D.C, Washington, Hawaii, Colorado, City of Philadelphia Pennsylvania, Maryland, Illinois, Oregon, and Rhode Island


Under California law, this product is or contains an unserialized “firearm precursor part” and cannot be sold into the State of California. 80% Arms cannot accept any orders of this product for shipment to the State of California, or to any customer who is a resident of the State of California.


Disclaimer: Copyright, and inappropriate content will unfortunately be cancelled and refunded. If you have any questions in regards about engravings, please reach out to our Customer Service Team ( or via Chat Box in the right hand corner 

Made in USA