AR-15 Detent and Spring Set | Pivot & Takedown Pin Kit

AR-15 Detent & Spring Kit for Takedown and Pivot Pins

The AR-15 detent and spring kit is one of the most commonly lost—but absolutely essential—components in any build. This kit includes everything needed for proper takedown pin spring and pivot pin detent function, ensuring your rifle stays secure while remaining easy to disassemble.

Whether you're completing a new lower, fixing a lost detent spring, or replacing worn parts, this set keeps your AR-15 functioning properly.

AR-15 Takedown Pin Spring & Detent Replacement

If your takedown pin feels loose or your rifle isn’t holding securely, it’s often due to a worn or missing takedown pin spring or detent. This kit provides the exact replacement parts needed to restore proper tension and function.

What Does This Detent and Spring Set Include?

This complete AR-15 detent and spring set includes:

• Rear takedown pin detent
• Rear takedown pin spring
• Front pivot pin detent
• Front pivot pin spring

Each component is precision-sized for proper fitment in mil-spec AR-15 lower receivers.

What Do AR-15 Detents and Springs Actually Do?

Detents and springs work together to lock your pins in place while still allowing movement when needed.

• Detents: Small metal pins that apply pressure against your takedown and pivot pins
• Springs: Provide tension to keep the detents engaged

Without them, your pins can slide out during use—making your rifle unsafe or unusable.

Do You Need This Kit for Your Build?

You need this set if you are building a stripped lower or replacing small parts typically found in a lower parts kit.

• Building a stripped AR-15 lower receiver
• Replacing lost or damaged detents/springs
• Experiencing loose or slipping takedown pins
• Keeping spare parts (highly recommended)

Pro tip: Most builders lose at least one detent during installation—having extras saves time and frustration.

Common Installation Questions (Answered)

Why do AR-15 detents fly across the room?

Because they’re under spring tension during installation. Without proper tools or technique, they can launch unexpectedly—earning them the nickname “the most lost part in an AR build.”

Are these compatible with all AR-15 lowers?

Yes—this kit is designed for standard mil-spec AR-15 platforms.

Do I need special tools to install them?

Not required, but highly recommended. A pivot pin installation tool or razor blade method can make installation much easier and prevent lost parts.

Why Builders Keep Extra Detents and Springs

These are some of the smallest and easiest-to-lose components in any AR-15 build. Keeping a spare set on hand ensures:

• No downtime during builds
• Quick repairs if parts are lost
• Less frustration during assembly

Built for Reliable Performance

Manufactured to meet mil-spec standards, these detents and springs provide consistent tension, secure fitment, and long-term durability—so your rifle performs exactly as it should.

This AR-15 detent and spring kit is a must-have for anyone working on takedown pins, pivot pins, or lower receiver assembly.

Don’t let a tiny part hold up your entire build—grab a set (or two) and build with confidence.