Pistol Caliber AR-15 Lower Receivers

Transform your AR-15 platform with specialized lower receivers designed specifically for pistol caliber builds. These precision-engineered receivers provide the critical foundation for converting your standard AR-15 to accommodate pistol ammunition platforms like 9mm, .40 S&W, and .45 ACP. Engineered for reliability, compatibility, and performance, pistol caliber lower receivers offer shooters READ MORE

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Reviews

See what our customers are saying about us!

AT3’s instructional videos on every aspect of the AR15 are invaluable. I watched them all on YouTube over the past week, and my first AR15 is being delivered today. I am looking forward to tinkering with my new rifle using AT3’s knowledge base as my guide.

~ John E.

First I wanna say amazing customer service my items arrived really fast and packaged very safely. Second the FDE is a perfect match for Magpul products. I paired my AT3™ FF-ML 10.5″ Complete AR 15 Pistol Upper with Franklin Armory lower with bfs||| trigger .. AMAZING! GOT A FOREVER CUSTOMER HERE AT3!

~ Joshua H.

I've ordered a few times from these guys. Prices are great. Things ship fast. Like next day shipped out. Can't ask for more! Also, their AT3 line of products are legit.

~ David J.

I ordered from AT3 for the first time on Monday and I received my order today (2 days later). When a lot of companies are making excuses for long turnover times, AT3 provides top notch customer service and very fast shipping.

~ Brian M.

Transform your AR-15 platform with specialized lower receivers designed specifically for pistol caliber builds. These precision-engineered receivers provide the critical foundation for converting your standard AR-15 to accommodate pistol ammunition platforms like 9mm, .40 S&W, and .45 ACP. Engineered for reliability, compatibility, and performance, pistol caliber lower receivers offer shooters a versatile solution for creating multi-purpose firearms that bridge the gap between pistol, PCC, and rifle platforms.

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