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.

Type III Hard Anodized Billet AR-45 80% Lower Receiver

Calculated at Checkout
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Your support means more than just business to us; it's the fuel for our ongoing legal fight to defend our 2A rights. Every purchase is a vital piece of this effort. Rest assured, our case is currently being heard at the 5th circuit and we're doing everything we can amidst this legal battle to get orders out.



Introducing the 80% Arms AR-45 lower receiver! This precision-machined lower is based on the time-tested AR framework and is designed to accommodate both .45 ACP and 10mm Glock magazines. Experience unmatched power from a shoulder-fired, pistol-caliber platform with this tight-tolerance, Type III hard anodized billet lower. The receiver is designed to accept any mil-spec standard AR-15 lower parts kit to take full advantage of the expansive AR-15 aftermarket support. 

Our 80% lowers are manufactured with 6061 T6 aluminum which combines the properties of ease of machining with long-lasting durability and corrosion resistance. 


  • Compatible with multiple .45ACP and select 10mm upper receivers

  • Type III hard anodized finish

  • Aggressively flared magwell for faster-than-ever reloads

  • Integrated trigger guard for ease of assembly

  • Compatible with .45 ACP and 10mm Glock magazines

  • Threaded bolt catch screw hole

  • Completed rear takedown lug pocket

  • Full mil-spec parts compatibility

  • Includes bolt catch screw set and Gen 2 PCC hardware set

  • Polymer Magazine Release

  • Fire Selector Engraving

*Please Note: Not compatible with Easy Jig® Gen 1 or Universal Drill Press Jig.

80 Percent Arms strives to provide the highest level of customer service within the 80% and firearm industry as a whole. We support all of our products with a lifetime warranty* so you can build with confidence.

You can always expect prompt and educational information as customer satisfaction is our bread and butter. For any questions or concerns regarding our products, please contact us at either, (949) 354-2767 or message us via our live chat!

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

Shipping Restrictions: 

This item is restricted from shipping to the following: California, Colorado, Connecticut, Hawaii, Illinois, Maryland, Nevada, New Jersey, New York, Oregon, Philadelphia Pennsylvania, Rhode Island, Washington, Washington D.C.

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.