Maintain tight, reliable function in your rifle with the AR15A4 Takedown Pin Spring (Part #160308114)—a small but essential component that helps keep your upper and lower receiver interface secure, responsive, and consistent. If you’re repairing a worn rifle, completing a lower parts build, or performing routine maintenance, this takedown pin spring is a critical replacement that supports smooth takedown pin operation and proper retention under real-world use.
Why the AR-15 Takedown Pin Spring Matters
In the AR-15 platform, the takedown pin system is what allows the rifle to hinge open and separate the upper and lower receivers for cleaning, inspection, and field maintenance. The takedown pin spring works alongside the detent to provide the tension that:
Keeps the takedown pin securely retained in the receiver
Delivers the familiar, positive click-in/click-out feel
Helps prevent accidental pin movement during handling or recoil
Supports consistent receiver fit and user confidence during operation
When this spring is damaged, kinked, worn, improperly installed, or missing, you may notice loose pin tension, inconsistent engagement, or pins that drift too easily. Replacing the spring restores proper detent pressure and helps return your rifle to correct, dependable function.
Ideal for Repairs, Builds, and Preventative Maintenance
Whether you’re assembling a new rifle, rebuilding a lower receiver, or refreshing a hard-used carbine, replacing small springs is smart insurance. Springs are among the most common wear items in any firearm platform, and the takedown pin spring is no exception—especially after multiple disassemblies, detent launches, or parts swaps.
The AR15A4 Takedown Pin Spring 160308114 is an excellent choice for:
AR-15 lower receiver builds and parts kits completion
Replacing springs lost during disassembly
Restoring proper takedown pin tension on older rifles
Maintenance for rifles used heavily in training or competition
Keeping spares in an armorer’s kit or range bag
Consistent Pin Tension for Better Handling
A properly tensioned takedown pin contributes to more than just convenience. It affects how confidently you can handle your rifle during:
Field stripping and reassembly
Clearing and inspections
Optic swaps and upper changes
Routine cleaning sessions
Transport and storage preparation
With a fresh spring installed, you can expect a more secure, predictable feel when pushing the takedown pin in and out—reducing annoyance and improving overall rifle usability.
Fits the AR-15 / AR15A4 Pattern
Designed for AR-pattern rifles in the AR15A4 configuration, this takedown pin spring is intended to match standard-spec takedown pin detent systems found in typical AR-15 lower receivers. It’s a simple, no-nonsense component that helps keep your receiver pins functioning the way they should.
Tip: If you’re replacing this spring, it’s often worth inspecting the takedown detent at the same time. Many issues come from wear, damage, or improper seating of the detent or spring.
Perfect for Completing a Lower Parts Refresh
When troubleshooting receiver pin issues, many builders immediately look at the pin itself—yet the real culprit is often spring fatigue or deformation. If you’re experiencing:
Mushy or weak takedown pin retention
Pins that feel too loose
Inconsistent detent engagement
A pin that doesn’t “snap” into place
…installing a new takedown pin spring can be a quick, effective fix that restores proper tension and function.
Product Details
Product: AR15A4 Takedown Pin Spring
Function: Provides detent tension for takedown pin retention and positive engagement
Platform: AR-pattern / AR15A4
Part Number: 160308114
A Small Part That Protects Big Performance
Don’t let a tiny spring compromise the feel and function of your rifle. The AR15A4 Takedown Pin Spring 160308114 is a must-have maintenance and build component that helps ensure your takedown pin stays secure, operates smoothly, and delivers consistent engagement every time you field strip or reassemble your AR.
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