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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NewAero Sale!
Aero Precision M5 Freedom Edition .308 Stripped AR-10 Lower Receiver
American Flag Edition Aero Precision M5 Lower Doesn't get more American than a stars-forward battle rifle! This special version of the Aero M5 AR-10 lower receiver features an American flag... -
Anderson Manufacturing AM-15 Complete AR 15 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... -
Aero Sale!
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...3 Options -
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... -
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Aero Precision M5 .308 Stripped AR-10 Lower Receiver
The Perfect Lower Receiver For Your Rifle Caliber AR-10 Build This Aero Precision M5 .308 Stripped Lower Receiver is the perfect part you need to build your AR-10 from the...2 Options -
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... -
Anderson Manufacturing Stripped AM-15 Lower Receiver Without Logo
Anderson Lower with No Logo - The Stealthy Stripped Lower Let's face it: some AR-15 lowers have obnoxious logos. This version of Anderson's stripped lower lacks their usual rollmark, giving... -
Anderson Manufacturing Stripped AM-15 Lower Receiver
Anderson Stripped Lower Receiver - Affordable and Reliable The AM-15 stripped lower is the starting point for many a builder jumping into the AR-15 hobby. Manufactured in Hebron, Kentucky, Anderson... -
KE Arms KP-15 Mil-Spec Monolithic Polymer AR 15 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... -
Angstadt Arms 0940 Stripped Lower Receiver – Accepts 9mm & .40 S&W Glock Magazines
Solid & Reliable Stripped Lower Receiver For Your Next 9mm Pistol Caliber Build The Angstadt Arms 0940 Stripped Lower Receiver is an outstanding option to start your pistol caliber build... -
Anderson Manufacturing Stripped AM-15 Lower Receiver with Trigger Guard
Anderson Lower with Trigger Guard - Less Risk of Damage This Anderson lower features an integrated trigger guard in its 7075-T6 aluminum body. This addition removes one of the weak... -
KE Arms KP-9 Stripped Polymer Lower Receiver – 9mm
Highly Durable & Cost-Effective PCC Stripped Polymer Lower The KE Arms KP-9 is a pistol caliber lower receiver designed with an integrated buttstock, buffer tube, pistol grip, and trigger guard... -
Angstadt Arms 0940 Stripped Upper/Lower Receiver Set – Accepts 9mm & .40 S&W Glock...
Build Your Next 9mm Pistol Caliber Rifle with a Solid Upper/Lower Set from Angstadt Arms The Angstadt Arms 0940 Set is an outstanding option to start your pistol caliber build... -
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... -
KE Arms KP-15 Stripped Monolithic Polymer AR 15 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... -
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... -
APF Stripped Side-Folding AR-15 Lower Receiver – .223/5.56 NATO
The Perfect Start to Build Your Next Side-Folding AR The APF Stripped Side-Folding AR-15 Lower Receiver is an innovative and reliable upgrade for AR-15 builders providing the most ideal set-up... -
KE Arms KP-15 Monolithic Polymer AR 15 Lower Receiver with SLT Trigger and Ambi...
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... -
KE Arms KE-15 Stripped AR-15 Lower Receiver – .223/5.56 NATO
High-Grade Stripped Lower Receiver For Your Next AR-15 The KE Arms KE-15 Stripped AR-15 Lower Receiver is a reliable and inexpensive option to start your next AR build from the... -
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... -
KE Arms KE-9 Stripped AR-15 Lower Receiver – Fits 9mm Glock Magazines
Dedicated 9mm Lower Receiver For A High-Performance PCC Build The KE Arms KE-9 is a high-quality dedicated lower receiver designed specifically for 9mm pistol-caliber carbine builds. It is built to... -
KE Arms KP-9 Complete Polymer Lower Receiver – 9mm – Includes Mil-Spec FCG, Buffer,...
Highly Durable & Cost-Effective 9mm Polymer Lower with Mil-Spec FCG, Buffer, & Spring The KE Arms KP-9 is a pistol caliber lower receiver designed with an integrated buttstock, buffer tube,... -
KE Arms KP-9 Complete Polymer Lower Receiver – 9mm – Includes SLT Trigger, Buffer,...
Highly Durable & Cost-Effective 9mm Polymer Lower with SLT Trigger & Ambi Safety The KE Arms KP-9 is a pistol caliber lower receiver designed with an integrated buttstock, buffer tube,... -
Aero Sale!
Aero Precision X15 AR-15 Gen 2 Stripped Lower Receiver
Improved AR-15 Lower For Easy Installation and 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
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