What is an AR-45?

The AR 45 80% LOWER RECEIVERS are exactly what it sounds like. An AR-style rifle chambered to shoot in 45 ACP. Rather than use a 45 ACP handgun, many like to opt for the AR45 to have a pistol caliber carbine. A Pistol Caliber Carbine, or “PCC,” is a short, lightweight rifle chambered in any caliber typically found in handguns, i.e., 9mm or .45 ACP.

AR45’s, in particular, have a lot of benefits as they have very low recoil, almost non-existent muzzle flash, and are extremely user friendly for beginners. For more experienced shooters, they make a great choice for personal defense with their maneuverability.


We have the best 80% billets on the market, and that goes for every caliber. Our AR 45 80% LOWER RECEIVERS billets are meticulously CNC machined to the highest quality standards out of 6061 aluminum, which is also used in the aerospace industry.

Remember, these 80% lower receivers are not completed parts, which require you to do the last 20% of the work. That’s why we don’t consider 80 lowers as firearms, allowing us to ship them straight to your door!

80% ARMS AR45 80 LOWER

At 80 Percent Arms, we highly value and believe in modularity.

Once you’re ready, complete your AR-45 build with our Easy Jig® Gen 3. This can help you build out other 80% lower receiver calibers as well!

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