80% Lower FAQs

Many people are interested in building their own AR model carbines but are uncertain of how to even begin. 80% lower receivers are a great way to get into the world of firearms without breaking your budget.

80 lowers (also referred to as “unfinished receivers” or “unfinished lowers”) are inexpensive and require only minor machining before they can be shaped into fireable weapons. Unfortunately, there’s a lot of information — and misinformation — out there concerning 80% lower receivers that can be hard to sort through.

Fortunately, at 5D Tactical, our mission is to empower firearms enthusiasts to efficiently build their own AR models. Therefore, we’ve waded into this sea of information so you don’t have to.

Frequently Asked Questions: 80% Lower Receiver FAQs

Private gun owners can turn to 80 lowers to reduce the work required for producing a workable firearm. However, to ensure that you produce quality work, it’s vital that you understand the subject matter.

What is an 80% Lower Receiver?

An 80% lower receiver is a firearm component that needs to be completed with 20% work before it can become a functional weapon. Rifles and carbines, like the M16, M4, or AR-15, consist of two main systems: the upper receiver and the lower receiver.

A lower receiver (or simply “a lower”) typically consists of the grip, trigger mechanism (bolt, hammer, etc.), and stock of the weapon. The “80%” designation indicates that the lower is not a firearm because it’s missing 20% of the vital components it needs to operate as a firearm.

Is an 80% Lower Receiver a Firearm?

No, an 80 lower is not a firearm. An 80% lower receiver only becomes a firearm, by law, once the fire control cavity is milled out with an 80% lower jig.

Are 80% Lowers Legal?

Yes. Because 80 lowers are not considered firearms, you can legally purchase one without the need to find a Federal Firearms Licensed (FFL) dealer or undergo a background check.

Do I Need a License for an 80% Lower Receiver Kit?

No. Because unfinished lowers aren’t classified as firearms, you aren’t required to carry a license in order to purchase them.

What 80 Lower to Buy?

You should invest in an 80% lower receiver from a manufacturer with a trusted reputation for being knowledgeable, reliable, and professional. Fortunately, at 5D Tactical, we’re also passionate and collaborative, so you can trust that we’ll make your journey into amateur gunsmithing a rewarding experience.

Is a Jig Required?

Yes, an 80% lower jig is required to create a working firearm out of your 80 lower receiver. You’ll also need at least a drill press to complete the process as well.

How Hard is it to Finish an 80 Lower?

Private gun owners who possess a basic understanding of the tools and materials, as well as at least a drill press, can finish converting an 80 lower with minimal issues.

Is it Hard to Complete?

Not necessarily. However, it may still take several hours to get it perfect, so remember to bring an adequate supply of patience.

What Tools are Needed to Assemble an 80 Lower?

In addition to the unfinished receiver and the 80 lower jig, amateur gunsmiths require the following materials and tools to properly assemble an 80% lower receiver:

  • Drill Press or Milling Machine
  • Machining Oil or Cutting Fluid
  • Vise

Stock Up on 80% Lower Receivers at 5D Tactical

Building a working firearm out of an incomplete, DIY 80 lower kit is a very rewarding feeling. If you have more questions about designing your own AR-15, AR-308/AR-10, or AR9 from an unfinished receiver kit, then reach out to our team today.

Order Status
Has my order shipped?
How do I track my order?
My order never arrived.
An item is missing from my shipment.
My product is missing parts.
When will my backorder arrive?
My Account
How do I create an account?
How do I edit my account information?
How much is my shipping?
I forgot my password.
Shipping and Returns
How do I return my product?
I received the wrong product.
What is your return policy?
When will my order ship?
Privacy Policy
Pricing and Billing
Do I have to pay sales tax?
I have a question on my charges.
I need a copy of my receipt/invoice.
When will my credit appear on my account?

Buyer's Guide
Do you offer a Military / Law Enforcement discount?
How do I buy/redeem a gift certificate?
How do I contact you?
How do I find a product?
How do I navigate the site?
How do I use a coupon?
80% Lowers
The Router Jig Universal Fitment Guarantee
What is an 80% lower receiver?