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).
This is the perfect kit for premium builds that include premium triggers like the AT3 Tactical 2-Stage Trigger. The kit contains quality, mil-spec parts and provides you with the flexibility to spend money on the parts you want – and none of the extras that will sit in your toolbox.
New Color Options!
We’ve added the option to get a Pro-Builder kit with all the parts you’ll see outside your gun in matching Cerakote! We’ve included a handy guide so you can make sure you’re getting the right color for your build. Naturally, these match with all of AT3’s other Cerakote AR parts.
Cerakote Finishes
- Flat Dark Earth: H-267 Magpul® Flat Dark Earth
- OD Green: H-232 Magpul® OD Green
- Pink: H-224 SIG™ Pink
- Red: H-167 USMC Red
- Blue: H-171 NRA Blue
- Burnt Bronze: H-148 Burnt Bronze
- Tungsten: H-237 Tungsten
- Titanium: H-170 Titanium
American Made Quality
- All parts meet or exceed military specifications (Mil Spec)
- Components are 100% Made in the USA
- Quality packaging keeps components protected and organized
- Backed by the AT3 Lifetime Warranty
This Kit Includes:
- Bolt catch
- Bolt catch plunger
- Bolt catch roll pin
- Bolt catch spring
- Buffer retainer
- Buffer retainer spring
- Magazine catch
- Magazine catch button
- Magazine catch spring
- Pivot pin
- Pivot pin detent
- Pivot pin detent spring
- Selector
- Selector detent
- Selector detent spring
- Takedown pin
- Takedown pin detent
- Takedown pin detent spring
- Pistol grip screw and lock washer
- Detailed parts diagram included for quick and easy part identification
Products available on this page:
- AT3™ Pro-Builder™ AR-15 Lower Parts Kit - No Grip or Trigger Assembly - Black - Color: Black | SKU: LPK-PROBUILD-1 | UPC: 5060748421746
- AT3™ Pro-Builder™ AR-15 Lower Parts Kit - No Grip or Trigger Assembly - Flat Dark Earth - Color: Flat Dark Earth | SKU: LPK-PROBUILD-FDE | UPC: 5060748422828
- AT3™ Pro-Builder™ AR-15 Lower Parts Kit - No Grip or Trigger Assembly - OD Green - Color: OD Green | SKU: LPK-PROBUILD-ODG | UPC: 5060748422835
- AT3™ Pro-Builder™ AR-15 Lower Parts Kit - No Grip or Trigger Assembly - Pink - Color: Pink | SKU: LPK-PROBUILD-PNK | UPC: 5060748422842
- AT3™ Pro-Builder™ AR-15 Lower Parts Kit - No Grip or Trigger Assembly - Red - Color: Red | SKU: LPK-PROBUILD-RED | UPC: 5060748422859
- AT3™ Pro-Builder™ AR-15 Lower Parts Kit - No Grip or Trigger Assembly - Blue - Color: Blue | SKU: LPK-PROBUILD-BLU | UPC: 5060748422811
- AT3™ Pro-Builder™ AR-15 Lower Parts Kit - No Grip or Trigger Assembly - Burnt Bronze - Color: Burnt Bronze | SKU: LPK-PROBUILD-BB | UPC: 5060748422804
- AT3™ Pro-Builder™ AR-15 Lower Parts Kit - No Grip or Trigger Assembly - Tungsten - Color: Tungsten | SKU: LPK-PROBUILD-TG | UPC: 5060748422866
- AT3™ Pro-Builder™ AR-15 Lower Parts Kit - No Grip or Trigger Assembly - Titanium - Color: Titanium | SKU: LPK-PROBUILD-TI | UPC: 5060748422873
