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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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...6 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...2 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 -
Aero Precision X15 AR-15 Gen 2 Stripped Lower Receiver with Trigger Guard
Improved Aero Precision Lower with Billet Trigger Guard The Aero Precision X15 Gen 2 is the stripped AR-15 lower of choice for many shooters across the nation. With improvements for...3 Options -
Aero Precision M4E1 Freedom Edition AR-15 Lower Receiver
Aero Precision US Flag AR-15 Lower Receiver Always Forward, Never Retreat! Aero Precision's M4E1 Lower Receiver adds unique engravings to a striking design to show your national pride. This AR-15... -
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 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 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... -
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... -
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... -
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... -
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... -
Aero Precision Tacoma Pride M4E1 AR-15 Lower Receiver with Classic Logo
M4E1 Lower with Classic Aero Precision Logo New school design, classic logo. The Tacoma Pride M4E1 lower features Aero Precision's old school logo on their latest and greatest AR-15 lower... -
KE Arms KP-15 Monolithic Polymer AR-15 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... -
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-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,... -
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-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... -
KE Arms KP-9 Complete Polymer Lower Receiver with Mil-Spec Trigger – 9mm
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,...
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