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.
Sort
Filter
Show In-Stock Only?
Price
Brand
- Lower Receiver Parts - AT3 Tactical (49)
- Lower Receiver Parts - Strike Industries (21)
- Lower Receiver Parts - Battle Arms Development (11)
- Lower Receiver Parts - Radian Weapons (9)
- Lower Receiver Parts - Timber Creek (8)
- Lower Receiver Parts - CMMG (8)
- Lower Receiver Parts - Armaspec (8)
- Lower Receiver Parts - Odin Works (7)
- Lower Receiver Parts - Phase 5 (6)
- Lower Receiver Parts - Magpul (6)
- Lower Receiver Parts - Aero Precision (6)
- Lower Receiver Parts - Luth-AR (4)
- Lower Receiver Parts - LBE Unlimited (4)
- Lower Parts - Fortis (4)
- Lower Receiver Parts - Sons of Liberty Gun Works (3)
- Lower Receiver Parts - KE Arms (3)
- Lower Receiver Parts - JP Enterprises (3)
- Lower Receiver Parts - Ergo (3)
- Lower Receiver Parts - Tyrant CNC (2)
- Lower Receiver Parts - Troy (2)
- Lower Receiver Parts - Mission First Tactical (2)
- Lower Receiver Parts - Kaw Valley Precision (2)
- Lower Receiver Parts - KAC (2)
- Lower Receiver Parts - Badger Ordnance (2)
- Lower Receiver Parts - B5 Systems (2)
- Lower Receiver Parts - Arms Unlimited (2)
- Lower Receiver Parts - Anderson (2)
- Lower Receiver Parts - Yankee Hill Machine (1)
- Lower Receiver Parts - Wilson Combat (1)
- Lower Receiver Parts - Timney Triggers (1)
- Lower Receiver Parts - Rise Armament (1)
- Lower Receiver Parts - KNS Precision (1)
- Lower Receiver Parts - Guntology (1)
- Lower Receiver Parts - Geissele (1)
- Lower Receiver Parts - Elftmann Tactical (1)
- Lower Receiver Parts - CMC Triggers (1)
- Lower Receiver Parts - Bravo Company (1)
Caliber
Color
- Lower Receiver Parts - Black (109)
- Lower Receiver Parts - Flat Dark Earth (52)
- Lower Receiver Parts - Red (43)
- Lower Receiver Parts - Blue (38)
- Lower Receiver Parts - OD Green (37)
- Lower Receiver Parts - Gray (30)
- Lower Receiver Parts - Tungsten (21)
- Lower Receiver Parts - Burnt Bronze (19)
- Lower Receiver Parts - Pink (16)
- Lower Receiver Parts - Titanium (14)
- Lower Receiver Parts - Purple (10)
- Lower Reciever Parts - Silver (10)
- Lower Receiver Parts - Gold (5)
- Lower Receiver Parts - Stainless (4)
- Lower Receiver Parts - Tan (3)
- Lower Receiver Parts - Brown (2)
- Lower Receiver Parts - NP3 (1)
List
Grid
-
AT3™Sale!
AT3™ FU-BAG™ AR-15 Lost Parts Kit – Springs, Detents, Replacement Components
Made an "Oops" with your New Build? You Detent-Launchin', Spring-Losin' Fool, you. We've all been there. Whether it's rolling the dice on that bargain bin LPK in your local...2 Options -
AT3™Sale!
AT3™ Mil-Spec AR-15 Pivot Pin/Takedown Pin Detent Springs – Set of 2
AT3™ Mil-Spec AR-15 Pivot Pin/Takedown Pin Detent Springs - Set of Two All AT3 Tactical lower receiver parts meet or exceed Mil Spec. These parts are guaranteed to fit and... -
AT3™Sale!
AT3™ MOTHERFU-BAG™ – The BIG AR-15 Lost Parts Kit – Springs, Detents, Wear Parts,...
Launch a detent? Snap a spring? Don't get mad, just fix it with this AR-15 Lost Parts Kit! Alright, so y'all seem to like the FU-BAG. Like a lot. Which... -
AT3™Sale!
AT3™ Castle Nut for AR-15 Buffer Tubes – 10 Colors Available
Secure Your AR15 Buffer Assembly with a Steel Castle Nut This steel castle nut is an essential piece of an AR15 buffer tube/stock assembly. With standard cuts for use with...10 Options -
AT3™Sale!
AT3™ Mil-Spec AR-15 Buffer Retainer Spring
Mil-Spec AR-15 Buffer Retainer Spring All AT3 Tactical lower receiver parts meet or exceed Mil Spec. These parts are guaranteed to fit and function in your AR buffer assembly and... -
AT3™Sale!
AT3™ Mil-Spec AR-15 Selector Detent
Mil-Spec AR-15 Selector Detent All AT3 Tactical lower receiver parts meet or exceed Mil Spec. These parts are guaranteed to fit and function in your AR safety assembly and are... -
AT3™Sale!
AT3™ Mil-Spec AR-15 Bolt Catch Spring
Mil-Spec AR-15 Bolt Catch Spring All AT3 Tactical lower receiver parts meet or exceed Mil Spec. These parts are guaranteed to fit and function in your AR lower receiver and... -
AT3™Sale!
AT3™ Mil-Spec AR-15 Selector Detent Spring
Mil-Spec AR-15 Selector Detent Spring All AT3 Tactical lower receiver parts meet or exceed Mil Spec. These parts are guaranteed to fit and function in your AR mag catch assembly... -
AT3™Sale!
AT3™ Mil-Spec AR-15 Bolt Catch Plunger
Mil-Spec AR-15 Bolt Catch Plunger Looking for a high-quality bolt Catch Plunger for your AR-15? Look no further than AT3 Tactical. Our Bolt Catch Plunger is designed to meet or... -
AT3™Sale!
AT3™ Mil-Spec AR-15 Buffer Retainer
AT3 Tactical Mil-Spec AR-15 Buffer Retainer If you're looking for a reliable buffer retainer for your AR-15, look no further than the Mil-Spec AR-15 Buffer Retainer from AT3 Tactical. Made... -
10% Off!
Strike Industries AR Anti-Walk Pins
Strike Industries Anti-rotation/Anti-walk Pin Kit Enhance the security of your firearm with the Strike Industries Anti-rotation/Anti-walk pin kit. Say goodbye to worries about pins walking out during intense usage. Enjoy... -
10% Off!
Strike Industries AR-10 Enhanced Lower Receiver Parts Kit
Elevate Your Build with the Strike AR-10 Enhanced Lower Parts Kit Upgrade your AR-10 lower receiver with the Strike Industries Enhanced Lower Receiver Parts kit, featuring essential components for a... -
10% Off!
Strike Industries HEX 60-90 Degree Selector Switch for AR-15
Your Choice - Strike Industries HEX 60/90° Selector Switch Customization is key with the Strike Industries HEX 60/90° Ambidextrous Selector Switch for AR-15s. This versatile upgrade lets you choose between... -
10% Off!
Strike Industries Modular Bolt Catch for AR-15
Strike Industries Modular AR Bolt Catch This modular bolt catch lets you easily swap between 4 different button styles - standard, oversized, left extended, and right extended. No need to... -
AT3™Sale!
AT3™ Mil-Spec AR-15 Magazine Catch Spring
Mil-Spec AR-15 Magazine Catch Spring All AT3 Tactical lower receiver parts meet or exceed Mil Spec. These parts are guaranteed to fit and function in your AR mag catch assembly... -
10% Off!
Strike Industries AR MAGSTOP Fixed Magazine Converter
Legally Store Your AR with This Cost-Effective Solution The Strike Industries AR MAGSTOP provides a simple way to configure your AR-15 or AR-10 for legal fixed magazine storage per certain... -
10% Off!
Strike Industries Pistol Grip Plug Tool Holder Insert
Handy Tool Hideaway - The Strike Pistol Grip Tool Holder Transform your grip into a discreet tool caddy with the Strike Pistol Grip Plug Tool Holder Insert. This nifty drop-in... -
AT3™Sale!
AT3™ Mil-Spec AR-15 Pistol Grip Screw
AT3 Mil-Spec AR-15 Pistol Grip Screw Looking for a reliable replacement for your lost or damaged AR-15 Pistol Grip Screw? Look no further than AT3 Tactical. Our Mil-Spec AR-15 Pistol... -
AT3™Sale!
AT3™ Mil-Spec AR-15 Pistol Grip Lock Washer
Mil-Spec AR-15 Pistol Grip Lock Washer If you're looking for a Pistol Grip Lock Washer that meets or exceeds Mil-Spec, look no further than AT3 Tactical. Our lock washers are... -
AT3™Sale!
AT3™ Mil-Spec AR-15 Bolt Catch Pin
Mil-Spec AR-15 Bolt Catch PIN Looking for a high-quality Bolt Catch Pin for your AR-15? Look no further than AT3 Tactical. Our bolt catch pin is designed to meet or... -
AT3™Sale!
AT3™ Mil-Spec AR-15 Disconnector Spring
Mil-Spec AR-15 Disconnector Spring Looking for a durable and reliable Disconnector Spring for your AR-15 trigger? Look no further than AT3 Tactical. Our Disconnector Spring is designed to meet or... -
AT3™Sale!
AT3™ Mil-Spec AR-15 Trigger Guard Roll Pin
Mil-Spec AR-15 Trigger Guard Roll Pin All AT3 Tactical lower receiver parts meet or exceed Mil Spec. These parts are guaranteed to fit and function in your AR trigger guard... -
AT3™Sale!
AT3™ Mil-Spec AR-15 Hammer/Trigger Pins – 2 Pcs
Mil-Spec AR-15 Hammer/Trigger Pins (2 Pieces) All AT3 Tactical lower receiver parts meet or exceed Mil Spec. These parts are guaranteed to fit and function in your AR trigger assembly... -
10% Off!
Strike Industries Extended Bolt Catch for AR15
A "Go Fast" Addition To Your Next Build The Strike Industries Extended Bolt Catch is a heavy-duty and reliable upgrade that makes your AR-15 quicker and easier to operate. It...
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