Lower Parts Kit for AR-15
From complete kits to individual pieces, AT3 has the lower parts you need to build your ultimate AR-15.
We provide high-quality lower receiver parts kit, safety selector, and mag release.
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- Lower Receiver Parts - AT3 Tactical (49)
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AT3™Sale!
AT3 Tactical AR-15 Safety Selector Assembly with Spring and Detent
AR-15 Safety Selector with Spring and Detent AT3's AR-15 Safety Selector Assembly comes with everything you need to install a new safety or replace your existing parts. This mil-spec style...10 Options -
AT3™Sale!
AT3™ Mil-Spec AR-15 Pivot Pin – 10 Colors Available
Mil-Spec AR-15 Pivot Pin This heavy-duty Mil-Spec Pivot Pin securely locks into and holds the upper and lower receivers in place. This US made pin is made of 8620 Alloy...10 Options -
AT3™Sale!
AT3™ Mil-Spec AR-15 Takedown Pin – 10 Colors Available
Mil-Spec AR-15 Takedown Pin The AT3 AR-15 Takedown pin is perfect for replacing a lost part or starting a new build. It has steel construction with a long-lasting phosphate finish,...10 Options -
10% Off!
Strike Industries Fang AR-15 Trigger Guard
Rugged and Refined Aluminum AR-15 Trigger Guards Elevate your AR's style and performance with the Strike Industries Fang Aluminum Trigger Guard. This eye-catching billet aluminum upgrade goes far beyond basic...4 Options -
10% Off!
Strike Industries AR-15 SHIFT Takedown and Pivot Pins
Strike Industries AR-15 SHIFT Takedown and Pivot Pins Effortlessly maintain your AR15 with Strike Industries' Shift Pins. Featuring an extended grip surface and Quick Detach mechanisms, these pins simplify disassembly...3 Options -
AT3™Sale!
AT3™ Mil-Spec AR-15 Magazine Catch – 10 Colors Available
Mil-Spec AR-15 Magazine Catch This magazine catch meets and exceeds mil-spec demands. Steel construction with proper threading and dimensions, plus a durable Melonite finish to lasting wear protection. If you...10 Options -
10% Off!
Strike Industries Flip Switch AR-15 Safety Selector
Flippin Fun Safety Switch The Strike Industries Flip Switch bridges the gap between basic functionality and high-speed performance. Carefully sculpted ergonomics allow for confident engagement and disengagement, even in adverse...4 Options -
10% Off!
Strike Industries Picatinny Stock Adapter for Bufferless AR-15
Versatile Picatinny Stock Adapter The Strike AR Picatinny Stock Adapter opens up a new world of customization for your AR platform. Easily mount folding stocks, stabilizers, and other accessories thanks...3 Options -
10% Off!
Strike Industries Fang AR-15 Trigger Guard and Magwell
Accelerate Your Reloads - Fang Polymer Trigger Guard Fumbling for flawless reloads? The Strike Industries Fang Trigger Guard puts an end to sluggish mag changes with its 'Fang' design. This...2 Options -
10% Off!
Strike Industries AR-10 SHIFT Takedown and Pivot Pins
Strike Industries Shift Pins for AR-10/LR-308 These pins feature an extended grip surface for easy disassembly, eliminating the need for a pin punch. Additionally, the Quick Detach mechanism removes the...3 Options -
10% Off!
Strike Industries AR-15 Enhanced Takedown and Pivot Pins
Strike Industries Extended Takedown and Pivot Pins Upgrade your AR with Strike Industries' Extended Takedown and Pivot Pins, available in black, chrome, or gold finishes. Perfect for shooters seeking a...3 Options -
Guntology PDQ Ambidextrous AR-15 Bolt Release
Ambidextrous AR-15 Bolt Catch - Convert Any Mil-Spec Lower The PDQ (Pretty Damn Quick) Ambidextrous bolt release upgrades your AR-15 for ease of use, whether you're right or left handed.... -
Anderson Manufacturing AR-15 Lower Parts Kit – Stainless Hammer & Trigger
Everything You Need To Complete Your Lower Receiver The Anderson Manufacturing AR-15 Lower Parts Kit is a complete lower components kit that includes everything you need to complete your lower... -
Anderson OOPS! Kit – AR-15 Springs, Detents and More
Anderson OOPS! Kit Sometimes parts go missing or need replacement. Don't be caught unprepared with a useless rifle and stand ready with the Anderson OOPS! Kit. The kit fits easily... -
Timber Creek Outdoors Ambidextrous AR 15 Safety Selector
90 or 45 Degree Ambi Safety - Form and Function for Everyone The Timber Creek Outdoors Ambidextrous Safety Selector replaces your existing selector all allows for enhanced safety control for...8 Options -
AT3™Sale!
AT3™ Mil-Spec AR-15 Magazine Catch Button – 10 Colors Available
Mil-Spec AR-15 Magazine Catch Button All AT3 Tactical lower receiver parts meet or exceed Mil Spec. The magazine catch button is no exception. Steel construction with proper threading and dimensions,...10 Options -
Timber Creek Outdoors Extended Magazine Release – AR-EMR
Great Performance on Your AR with Timber Creek Outdoors Extended Magazine Release Timber Creek's Extended Magazine Release allows for fast and easy magazine changes for all shooters. Ergonomic texturing machined...8 Options -
AT3™Sale!
AT3 Tactical AR-15 Ambidextrous Safety Selector Assembly
Ambidextrous Safety Kit for AR-15 An ambidextrous safety selector is an easy, effective upgrade for modernizing your AR-15. This safety assembly features an easy-to-install safety drum, with an additional lever...10 Options -
AT3™Sale!
AT3™ Mil-Spec AR-15 Safety Selector – 10 Colors Available
Mil-Spec AR-15 Safety Selector The classic mil-spec safety selector is a great choice for any shooter. Featuring all steel construction, a 90 degree throw for safe and fire, and a...10 Options -
10% Off!
Strike Industries Ultra Light Takedown Pins for AR15
Ultra-Light Take Down Pins For Custom Rifle Builds The Strike Industries Ultra Light Takedown Pins is a cost-effective but durable solution in reducing the weight of AR-15 ideal for custom...4 Options -
Timber Creek Outdoors Small Parts Pack – Ambidextrous Safety, Extended Mag Release, and Takedown/Pivot...
Make Your Lower Unique and Easier to Use Complete your lower with style and enhanced ergonomics! Save money by bundling a unique Timber Creek Outdoors Ambidextrous Safety, Extended Magazine Release,...8 Options -
Yankee Hill Machine EZ Pull AR15 Takedown Pins
Yankee Hill Machine EZ Pull AR15 Takedown Pins Never struggle to get an AR15 takedown pin out ever again with the YHM EZ Pull Takedown Pins. Using enlarged heads for... -
Magpul Enhanced AR-15 Magazine Release – MAG568
Enhanced Mag Release For A Smooth & Fumble-free Magazine Changes The Magpul Enhanced Magazine Release - MAG568 is designed with a larger contact surface making it easily accessible to all... -
Timber Creek Outdoors AR Pivot and Takedown Pin Set – AR-TPS
Cerakote or Anodized Takedown and Pivot Pin Set These CNC machined pins are an upgrade for your standard Mil-Spec lower, allowing easier disassembly with extended, textured caps. Starting a fresh...8 Options
Other Lower Receiver Components for AR 15:
AR 15 Buffer Tube Parts (Receiver Extension)
AR-15 Triggers
Buttstocks
Lower Parts Kit for AR-15
Magazines & Parts
Pistol Grips
AR-15 Trigger Guards