Lower Receiver Part Kits

Lower Receiver Part Kits

Get everything you need to complete or upgrade your AR lower with our premium parts kits. Each kit includes essential components like springs, detents, pins, and more, all designed for a precise fit and reliable performance.

Perfect for new builds or refreshing worn parts, these kits are a hassle-free way to READ MORE

Filter
Sort
LIST
Sale!
(532)

AT3™ FU-BAG™ AR-15 Lost Parts Kit – Springs, Detents, Replacement Components
2 Options
from $8.49
from $7.22
Out of Stock
View Product
Sale!
(41)

AT3™ MOTHERFU-BAG™ – The BIG AR-15 Lost Parts Kit – Springs, Detents, Wear Parts, and More
$21.49
Only
$18.27
Out of Stock
View Product
Sale!
AT3™ Mil-Spec AR-15 Pivot Pin/Takedown Pin Detent Springs - 2 Pcs
(42)

AT3™ Mil-Spec AR-15 Pivot Pin/Takedown Pin Detent Springs – Set of 2
$1.39
Only
$1.18
Out of Stock
View Product
Sale!
AT3™ Mil-Spec AR-15 Buffer Retainer Spring
(16)

AT3™ Mil-Spec AR-15 Buffer Retainer Spring
$1.19
Only
$1.01
Out of Stock
View Product
Sale!
AT3 Pro-Builder AR-15 Lower Build Kit
(1)

AT3™ Pro-Builder™ Black AR-15 Lower Build Kit
$69.98
Only
$59.48
Out of Stock
View Product
Sale!
AT3™ Mil-Spec AR-15 Selector Detent
(5)

AT3™ Mil-Spec AR-15 Selector Detent
$1.19
Only
$1.01
Out of Stock
View Product
Sale!
AT3™ Mil-Spec AR-15 Selector Detent Spring
(3)

AT3™ Mil-Spec AR-15 Replacement Safety Selector Detent/Ejector Spring
$1.19
Only
$1.01
Out of Stock
View Product
Sale!
AT3™ Mil-Spec AR-15 Bolt Catch Plunger
(10)

AT3™ Mil-Spec AR-15 Bolt Catch Plunger
$1.69
Only
$1.44
Out of Stock
View Product
Sale!
AT3™ Mil-Spec AR-15 Bolt Catch Spring
(5)

AT3™ Mil-Spec AR-15 Bolt Catch Spring
$1.19
Only
$1.01
Out of Stock
View Product
Sale!
AT3™ Mil-Spec AR-15 Buffer Retainer
(9)

AT3™ Mil-Spec AR-15 Buffer Retainer
$2.49
Only
$2.12
Out of Stock
View Product
Sale!
AT3 Tactical Pistol Grip Screw for AR-15
(9)

AT3™ Mil-Spec AR-15 Pistol Grip Screw
$1.19
Only
$1.01
Out of Stock
View Product
Sale!
AT3™ Mil-Spec AR-15 Pistol Grip Lock Washer
(7)

AT3™ Mil-Spec AR-15 Pistol Grip Lock Washer
$1.19
Only
$1.01
Out of Stock
View Product
Sale!
AT3™ Mil-Spec AR-15 Magazine Catch Spring
(5)

AT3™ Mil-Spec AR-15 Magazine Catch Spring
$1.19
Only
$1.01
Out of Stock
View Product
Sale!
AT3 Bolt Catch Roll Pin
(2)

AT3™ Mil-Spec AR-15 Bolt Catch Pin
$1.19
Only
$1.01
Out of Stock
View Product
Sale!
AT3™ Mil-Spec AR-15 Disconnector Spring
(8)

AT3™ Mil-Spec AR-15 Disconnector Spring
$1.19
Only
$1.01
Out of Stock
View Product
Sale!
AT3™ Mil-Spec AR-15 Trigger Guard Roll Pin
(2)

AT3™ Mil-Spec AR-15 Trigger Guard Roll Pin
$1.19
Only
$1.01
Out of Stock
View Product
Sale!
AT3™ Mil-Spec AR-15 Hammer/Trigger Pins – 2 Pcs
(8)

AT3™ Mil-Spec AR-15 Hammer/Trigger Pins – 2 Pcs
$3.99
Only
$3.39
Out of Stock
View Product
Sale!
AT3™ Enhanced Mil-Spec AR-15 Hammer
(8)

AT3™ Enhanced Mil-Spec AR-15 Hammer
$24.99
Only
$21.24
Out of Stock
View Product
Sale!
AT3™ Mil-Spec AR-15 Disconnector
(7)

AT3™ Mil-Spec AR-15 Disconnector
$5.49
Only
$4.67
Out of Stock
View Product
Sale!
AT3™ Enhanced Mil-Spec AR-15 Trigger
(2)

AT3™ Enhanced Mil-Spec AR-15 Trigger
$24.99
Only
$21.24
Out of Stock
View Product
Sale!
AT3™ Mil-Spec AR-15 Hammer Spring
(2)

AT3™ Mil-Spec AR-15 Hammer Spring
$3.49
Only
$2.97
Out of Stock
View Product
Sale!
AT3™ Mil-Spec AR-15 Trigger Spring
(3)

AT3™ Mil-Spec AR-15 Trigger Spring
$2.99
Only
$2.54
Out of Stock
View Product
RECOMMENDED
Sale!
(121)

AT3™ Pro-Builder™ AR-15 Lower Parts Kit – No Grip or Trigger Assembly
9 Options
from $29.99
from $25.49
Out of Stock
View Product
Sale!
AT3 Tactical AR-15 Ultimate Cerakote Color Upgrade Kit - Flat Dark Earth
(10)

AT3 Tactical AR-15 Ultimate Cerakote Color Upgrade Kit
8 Options
from $109.99
from $93.49
Out of Stock
View Product

Get everything you need to complete or upgrade your AR lower with our premium parts kits. Each kit includes essential components like springs, detents, pins, and more, all designed for a precise fit and reliable performance.

Perfect for new builds or refreshing worn parts, these kits are a hassle-free way to keep your AR running at its best.

Back to top
Top searches:
handguardmagpulbuffer tubebcgcharging handleforegrippmagslingstockbuffer

SIGN IN

CREATE AN ACCOUNT

Passwords must be at least 7 characters long

Passwords must include a letter and number

Your personal data will be used to support your experience throughout this website, to manage access to your account, and for other purposes described in our privacy policy.