AR-15 Lower Receivers
The AR-15 lower receiver is a key portion of your build. It’s the one part of the AR-15 that is serialized and considered a “firearm”, and its sale is regulated by the ATF. AT3 strives to make the process as simple as possible to help you shop for the lower you want, with prompt shipment to your FFL of choice. Just make sure to brush up on your local regulations before making an order! READ MORE
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Unbranded AR Ambidextrous Lower Receiver
Affordable Ambidextrous AR-15 Lower Receiver Making the AR-15 friendly for left-handed shooters used to be a tall order. Thankfully for the southpaws out there, starting a completely ambidextrous lower build... -
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KE Arms KP-15 Stripped Monolithic Polymer Lower Receiver – Black
Build your KP-15 the way you want! For all the parts you'll need to complete your build, check out the KP-15 Lower Parts Kit! The KP-15 from KE Arms is... -
New
KE Arms KP-15 Mil-Spec Monolithic Polymer Lower Receiver – OD Green
OD Green Polymer Lower with GI Trigger and Ambi Safety The strongest polymer AR lower ever, available for a limited time in OD Green. The color of this lower is... -
New
KE Arms KP-15 Mil-Spec Monolithic Polymer Lower Receiver – Black
Lightweight Monolithic Lower with Proven Mil-Spec Components Polymer AR-15 lowers are nothing new; but the KP-15 from KE Arms is the best version that's ever been made. The single piece... -
New
KE Arms KP-15 Monolithic Polymer Lower Receiver with SLT Trigger and Ambi Controls –...
Innovation, Form, and Function - Monolithic Polymer Lower with Match Trigger Lighter weight, ambidextrous controls, and a great trigger with enhanced safety features. This package of the KP-15 polymer lower... -
New
KE Arms KP-15 Monolithic Polymer Lower Receiver with DMR Trigger and Ambi Controls –...
Complete KP-15 Lower with Precision Adjustable Trigger KE Arms' DMR trigger makes a great match for the KP-15 polymer lower receiver. The trigger has an ultra-crisp, 4.5 pound pull with... -
New
KE Arms KP-15 Monolithic Polymer Lower Receiver with SLT Trigger and Ambi Controls –...
Limited Run OD Green Lower with Sear Link Technology Trigger How do you make the best polymer AR-15 lower even better? Start with one of the best triggers on the... -
New
KE Arms KP-15 Monolithic Polymer Lower Receiver with Rekluse Trigger and Ambi Controls –...
Lightweight Polymer Lower with Enhanced Reliability Trigger KE Arms' KP-15 has a new trigger option that's truly a cut above the rest of the match trigger market. The Rekluse trigger... -
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Anderson Manufacturing AM-15 Complete Lower Receiver
Great Quality, Great Price, A Perfect Start to a Budget Build Anderson lowers are among the most affordable you can find, and they're a fantastic value. Forged 7075 T6 Aluminum... -
New
FMK Firearms AR1 Extreme AR-15 Stripped Lower Receiver – .223/5.56 – Black Polymer
Extremely Durable & Lightweight Stripped Lower Receiver Made From Polymer The FMK Firearms AR1 Extreme AR-15 Stripped Lower Receiver is constructed from a state-of-the-art impact-resistant Polymer that is proven to... -
Aero Precision X15 AR-15 Gen 2 Stripped Lower Receiver
Improved AR-15 Lower For A Great & Reliable Performance The Aero Precision Gen 2 AR-15 Stripped Lower Receiver is the perfect base for your custom AR15 build. Machined and designed...2 Options -
Aero Precision M4E1 AR-15 Lower Receiver
Enhanced Forged Lower Receiver With Exceptional Functionality The Aero Precision M4E1 is an enhanced forged lower receiver model that delivers visual upgrades and billet aesthetics for your AR-15 build. It...2 Options -
Aero Precision Complete AR-15 Lower Receiver
Complete Lower Receiver for Completing Your Next AR-15 The Aero Precision Standard Complete Lower is the perfect base for your custom AR15 rifle to get the quick and easy way...
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