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300-blackoutupper-com: 80% Lowers, Jigs, Build Kits & More! – 80 Lower Jig


›› 80 Lower Receiver FAQs

›› 80% Lower Jig Instructions

›› AR-15 Pistol FAQs

›› AR-15 5D Tactical Jig FAQs

Building your own 300 Blackout AR is a tremendous amount of fun! Getting into your first or even your second build can be intimidating and even a seasoned builder runs into questions. At 300 Blackout Upper we want to equip you with all the parts and information you need to complete your build. However, we by no means are providing legal advice or counsel and you should always contact your local ATF officials if there are any questions. 

We often get a lot of questions around the legalities of the 80% lower and AR-15 Pistol specifically, so we wanted to take a few moments to provide you with some guidance.

General 300 Blackout Upper FAQs

How can I contact 300 Blackout Upper or find more information regarding my order?
Please fill out our Contact Request form found here, or contact us at

How do I cancel my order?
Please fill out our Contact Request form found here and make sure to include your order # and the reason you would like to cancel your order, or contact us at
Please be advised that we charge a 5% order cancellation fee to cover the bank fees we incur for canceling your order.

Do you sell to New Jersey?

New Jersey’s attorney general recently demanded that companies stop marketing and selling untraceable weapons or “ghost guns”. Therefore, we are not allowing sales or shipping of any of our items to the state of New Jersey. See N.J.S.A. 2C:39-9g


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