Lower Receiver Part Kits
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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™ 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... -
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-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... -
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... -
AT3™Sale!
AT3™ AR 15 Enhanced Lower Parts Kit with Nickel Teflon Trigger – No Grip...
Tired of swapping out parts? Build the lower you actually want. This premium lower parts kit features our AT3 Enhanced Nickel Teflon Trigger, giving you the quality trigger your rifle... -
AT3™Sale!
AT3™ 2-Stage AR 15 Lower Parts Kit with Nickel Boron Trigger – No Grip...
Experience the difference a 2-Stage Trigger makes in your next build. AT3 is pleased to offer the dependability of our Pro-Builder Lower Parts kit with the 2-Stage Nickel Boron Trigger.... -
AT3™Sale!
AT3™ Mil-Spec AR-15 Disconnector
Mil-Spec AR-15 Steel Disconnector All AT3 Tactical lower receiver parts meet or exceed Mil Spec. These parts are guaranteed to fit and function in your AR trigger assembly and are... -
10% Off!
Strike Industries Enhanced Bolt Catch for AR15
Features An Extra-Wide Bolt Catch Lever For A Smoother Shooting Experience The Strike Industries Enhanced Bolt Catch is an exceptional upgrade for AR-15 builds, which features an extra-wide bolt catch... -
AT3™Sale!
AT3™ Enhanced Mil-Spec AR-15 Hammer
Mil-Spec AR-15 Hammer, Coated with Nickel Teflon All AT3 Tactical lower receiver parts meet or exceed Mil Spec. These parts are guaranteed to fit and function in your AR15 or... -
AT3™Sale!
AT3™ Mil-Spec AR-15 Hammer Spring
Mil-Spec AR-15 Hammer Spring Looking for a durable and reliable Hammer Spring for your AR-15 trigger? Look no further than AT3 Tactical. Our Hammer Spring is designed to meet or...
Other Lower Parts Kit for AR-15:
Lower Receiver Part Kits
Mag Release
Other Lower Parts
Safety Selector
Bolt Catch
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