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80% Lower News

80% Lower Jig FAQs

Posted by Chad Myers on

Do I need to be a licensed gunsmith or have an FFL to buy a lower jig?
Can an 80% jig be shipped directly to my place of residence?
What type of material are AR-15lowerreceivers.com 80% jigs made out of?
What are the tolerances of the 80% jig?
Do the 80% jigs come with any kind of warranty?
If using an 80% lower jig, do I need to have extensive gunsmithing experience in order to complete my lower receiver?
What tools do I need besides a AR-15lowerreceivers.com 80% Jig?
What brand of drill bits and end mills do you recommend?
Once I complete my lower receiver using an 80% jig, do I need to serialize it or fill out the BATFE Form 4473?
How do I complete the lower receiver with a lower jig?
Does my state have any laws that might apply to the purchase, ownership or operation of an 80% lower?
Can I contact AR-15lowerreceivers.com if I have questions regarding my 80% jig?


Do I need to be a licensed gunsmith or have an FFL to buy a lower jig?

No. The BATFE does not regulate the manufacturing, purchase or ownership of an 80% lower jig.

Can an 80% jig be shipped directly to my place of residence?

Yes. There are no laws pertaining to an 80% lower jig. Therefore, an 80% jig can be shipped directly to the purchaser.

What type of material are AR-15lowerreceivers.com 80% jigs made out of?

AR-15lowerreceivers.com 80% jigs are CNC machined from high quality 6061 aircraft grade aluminum.

What are the tolerances of the 80% jig?

AR-15lowerreceivers.com 80% jigs are machined to within +/- .001 tolerances. This insures the proper fit and function of your fire control group.

Do the 80% jigs come with any kind of warranty?

Yes.AR-15lowerreceivers.com offers a 100% Satisfaction Guarantee with each 80% jig. If for any reason you are not satisfied with your purchase, you can return the jig to us within 30 days for a full refund.

If using an 80% lower jig, do I need to have extensive gunsmithing experience in order to complete my lower receiver?

No. If you possess any sort of DIY skills and are proficient with a drill press, you can easily complete your own 80% lower.

What tools do I need besides a AR-15lowerreceivers.com 80% Lower Jig?

  • 5/32” Drill Bit
  • 3/8” Drill Bit
  • 5/16” Drill Bit
  • 3/8” End Mill
  • Dremel with 1⁄4” Grinding Head
  • Drill Press Vise
  • Drill Press 


What brand of drill bits and end mills do you recommend?

We recommend using the highest quality of bits and end mills you can afford. High quality bits and end mills will allow for easy drilling/milling and a finished product that looks professional.

Once I complete my lower receiver using an 80% jig, do I need to serialize it or fill out the BATFE Form 4473?

No. If the 80% lower is completed by the purchaser and used for personal use only, it does not need to be serialized. According to the BATFE: “Individuals manufacturing sporting-type firearms for their own use need not hold Federal Firearms Licenses (FFLs). However, we suggest that the manufacturer at least identify the firearm with a serial number as a safeguard in the event that the firearm is lost or stolen. Also, the firearm should be identified as required in 27 CFR478.92 if it is sold or otherwise lawfully transferred in the future.”

How do I complete the lower receiver with a lower jig?

For detailed instructions on how to complete your 80% lower using an 80% jig, please see here. The 80% jig also includes detailed step-by-step instructions.

Does my state have any laws that might apply to the purchase, ownership or operation of an 80% lower?

You are personally responsible to know any local, state or federal laws that may pertain to the purchase, manufacturing, or possession of an 80% lower in your particular state of residence before purchase.

Can I contact AR-15lowerreceivers.com if I have questions regarding my 80% lower jig?

Yes. Please fill out our Contact Form found here.

Completing an 80% lower isn’t as hard as you may believe. Whether you’re a first-time builder or have plenty of experience, the  Black Billet AR-15 80% Lower Receiver is the perfect place to start!

Start your build today!

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