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!
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RECOMMENDEDSale!
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... -
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KE Arms KE-9 Complete 9mm AR-15 Lower with SLT Trigger
Ambidextrous KE-9 Lower with SLT Trigger This complete KE-9 lower with KE Arm's Sear Link Technology trigger provides a solid foundation for your pistol caliber carbine build. This AR-9 lower... -
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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... -
Sale!
KE Arms KP-9 Complete Polymer Lower Receiver with SLT Trigger – 9mm
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,... -
Sale!
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... -
Sale!
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... -
Sale!
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... -
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Ballistic Advantage AR10 Enhanced Lower Receiver
Ballistic Advantage AR10 Enhanced Lower Receiver If you're looking to build a full rifle-sized caliber AR10 from scratch, the Ballistic Advantage BA10 Lower Receiver is an excellent choice. With its... -
RECOMMENDED
Aero Precision M4E1 AR-15 Lower Receiver
Enhanced Forged Lower Receiver With Exceptional Functionality The Aero Precision M4E1 enhanced forged lower receiver model delivers visual upgrades and billet aesthetics for your AR-15 build. Aero Precision custom designed...9 Options -
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...6 Options -
Aero Precision EPC-9 AR 15 Lower Receiver – Glock Magazine Compatible
Enhanced 9mm AR Lower Receiver for Pistol Caliber Carbines Before you ask - yes, it does take Glock mags. The EPC-9 offers enhanced ergonomics, simple installation, and unbeatable aesthetics for a...2 Options -
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...5 Options -
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 Precision X15 Receiver Set – AR-15 Lower Receiver with Assembled Upper Receiver
Aero AR-15 Lower and Upper Receiver Set Aero Precision's X-15 receiver set makes a solid foundation for your next AR-15 build. This matching set of lower and upper receiver includes...4 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... -
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... -
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... -
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... -
Aero Precision Tacoma Pride TAC-15 AR-15 Lower Receiver with Classic Logo
Aero Precision Lower with Retro Logo Aero Precision brought back their classic logo for one final run of forged AR-15 lower receivers. This limited edition lower features Aero Precision's old... -
Sale!
KE Arms KP-15 Stripped Monolithic Polymer AR 15 Lower Receiver
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...2 Options -
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... -
Angstadt Arms 0940 Stripped Upper/Lower Receiver Set – Accepts 9mm & .40 S&W Glock...
Build Your Next 9mm Pistol Caliber Carbine with a Solid Upper/Lower Set from Angstadt Arms The Angstadt Arms 0940 Set is an outstanding option to start your pistol caliber AR-15... -
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... -
Sale!
Ballistic Advantage AR15 Enhanced Lower Receiver
Ballistic Advantage AR15 Enhanced Lower Receiver The Ballistic Advantage AR15 Enhanced Lower Receiver offers a forged upper at an awesome price with billet aesthetics. This custom-designed enhanced forging is made...
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