Lower Receiver Part Kits
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AT3™
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™
AT3™ Mil-Spec AR-15 Pivot Pin/Takedown Pin Detent Springs – 2 Pcs
Mil-Spec AR-15 Pivot Pin/Takedown Pin Detent Springs (2 Pieces) All AT3 Tactical lower receiver parts meet or exceed Mil-Spec. These parts are guaranteed to fit and function in your AR... -
AT3™
AT3™ Mil-Spec AR-15 Pivot Pin/Takedown Pin Detents – 2 or 10 Piece
Mil-Spec AR-15 Pivot Pin/Takedown Pin Detents - 2 Piece or 10 Piece All AT3 Tactical lower receiver parts meet or exceed Mil Spec. These parts are guaranteed to fit and...2 Options -
AT3™
AT3™ Pro-Builder™ AR-15 Lower Parts Kit – No Grip or Trigger Assembly
Perfect Lower Parts Kit for the Premium Builds This quality lower parts kit excludes the two most commonly upgraded components - the grip and the trigger assembly (fire control group).... -
AT3™
AT3 Tactical AR-15 Takedown and Pivot Pin Assembly
AR-15 Takedown and Pivot Pins with Springs and Detents If you're completing an AR-15 lower, you won't get far without a good set of takedown and pivot pins. These mil-spec...10 Options -
AT3™
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™
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 and are perfect... -
AT3™
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 and are perfect... -
AT3™
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 and are perfect for... -
AT3™
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 and are perfect... -
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... -
AT3™
AT3™ Mil-Spec AR-15 Bolt Catch Plunger
Mil-Spec AR-15 Bolt Catch Plunger All AT3 Tactical lower receiver parts meet or exceed Mil Spec. These parts are guaranteed to fit and function in your AR and are perfect... -
AT3™
AT3 Tactical AR-15 Bolt Catch Assembly with Spring, Plunger, and Roll Pin
Mil-Spec AR-15 Bolt Catch with Hardware The AT3 AR-15 Bolt Catch Assembly has everything you need to upgrade or replace an existing bolt catch on your AR-15 lower. You get...10 Options -
AT3™
AT3™ AR15 Mil-Spec Bolt Catch – 10 Colors Available
Mil-Spec AR-15 Bolt Catch The bolt catch is an essential part of what makes the AR15 such a great rifle. AT3's bolt catch is a great addition to your next...10 Options -
AT3™
AT3™ Mil-Spec AR-15 Buffer Retainer
Mil-Spec AR-15 Buffer Retainer All AT3 Tactical lower receiver parts meet or exceed Mil Spec. These parts are guaranteed to fit and function in your AR and are perfect for... -
AT3™
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. It's made of 8620 Alloy steel and has a...10 Options -
AT3™
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 and are perfect... -
AT3™
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 melonite finish,...10 Options -
AT3™
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 -
AT3™
AT3™ Mil-Spec AR-15 Pistol Grip Lock Washer
Mil-Spec AR-15 Pistol Grip Lock Washer All AT3 Tactical lower receiver parts meet or exceed Mil Spec. These parts are guaranteed to fit and function in your AR and are... -
New
Battle Arms Development Aluminum AR-15 Takedown and Pivot Pin Kit
Battle Arms Development Aluminum AR-15 Takedown and Pivot Pins These Battle Arms Development Aluminum AR-15 Takedown and Pivot Pins come in a variety of colors to fit your build. These...4 Options -
AT3™
AT3™ Mil-Spec AR-15 Pistol Grip Screw
Mil-Spec AR-15 Pistol Grip Screw All AT3 Tactical lower receiver parts meet or exceed Mil Spec. These parts are guaranteed to fit and function in your AR and are perfect... -
New
Battle Arms Development Enhanced AR-15 Takedown and Pivot Pin Kit
Battle Arms Development Enhanced AR-15 Takedown and Pivot Pins The Battle Arms Development Enhanced AR-15 Takedown and Pivot Pin set upgrades your lower receiver. These steel pins feature a unique... -
New
Battle Arms Development Enhanced AR-10 Takedown and Pivot Pin Kit
Battle Arms Development Enhanced AR-10 Takedown and Pivot Pins The Battle Arms Development Enhanced Takedown and Pivot Pins for AR308 rifles improve over stock takedown pins. These pins fit in...
Other Lower Parts Kit for AR-15:
Lower Receiver Part Kits
Mag Release
Other Lower Parts
Safety Selector
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