Rankin Industries AR15 Spring Kit

Product Description

The Rankin Industries AR15 Spring Kit provides replacement springs for AR-15 and M16 lower receiver assemblies. This kit addresses one of the most common needs in AR builds and repairs: replacing the small springs that are easy to lose during disassembly or that wear over time.

Whether you’re completing a lower parts installation, repairing a damaged component, or keeping spares on hand, having the correct springs matters for function and reliability.

This spring kit works with standard AR-15 and M16 lower receivers. It suits builders, armorers, and anyone maintaining their own rifle.

Key Facts

• Brand: Rankin Industries
• Product Name: AR15 Spring Kit
• Firearm Type: AR-15/M16
• SKU: RI-SpringKit

What AR15 Lower Springs Do

AR-15 lower receivers use several small springs to control the trigger, hammer, bolt catch, takedown pins, and magazine release. Each spring performs a specific job: returning a pin to its detent, holding a lever in position, or resetting a control after use.

Lost or damaged springs are a common issue during lower receiver assembly or when swapping lower parts. A missing detent spring can make a takedown pin walk out under recoil. A weak trigger spring affects reset feel and timing.

Keeping a spring kit on hand prevents downtime when a tiny part goes missing on the bench or fails after extended use.

When You Need Replacement AR Springs

Springs wear with use, lose tension, or break. High round counts, dry fire practice, and repeated disassembly accelerate wear. If a control feels mushy, fails to return to position, or if a detent no longer holds, the spring is usually the cause.

Replacement is also common during trigger upgrades, lower parts kit installation, or any repair that requires removing pins and detents. Once a spring launches across the room, you need a replacement to finish the job.

AR15 Spring Compatibility

Standard AR-15 and M16 lower receivers share the same spring dimensions and functions. Mil-spec lowers use the same detent and spring positions regardless of manufacturer.

If you have an AR-15 variant with a proprietary lower design or a non-standard trigger system, confirm fitment before ordering. Call 817-393-4000 if you need help identifying which springs your build requires.

Buying from Western Sport in Roanoke, TX

Western Sport is a licensed FFL/SOT dealer and gunsmith shop serving North Texas and the DFW area since 2007. Owner and gunsmith Lance Rankin and his team handle transfers, builds, and repairs on site. Call 817-393-4000 for ordering, gunsmithing services, or technical questions about AR components.

Frequently Asked Questions

Q: What firearms does the Rankin Industries AR15 Spring Kit fit?

A: This spring kit fits AR-15 and M16 lower receivers. It works with mil-spec lowers from any manufacturer that follow standard AR-15 dimensions and pin locations.

Q: Can I use this spring kit to complete a lower parts installation?

A: Yes, this kit provides the springs needed for lower receiver assembly and parts replacement. It addresses the most common spring needs when installing or repairing lower components.

Q: How do I know if my AR15 springs need replacing?

A: Replace springs if controls feel weak, fail to return to position, or if detents no longer hold pins securely. Visible deformation, corrosion, or broken coils also indicate replacement is needed. Springs also require replacement if lost during disassembly.

Q: Will these springs work with aftermarket triggers?

A: Most aftermarket triggers use standard AR-15 lower receiver springs for detents and other controls. However, some drop-in trigger systems include proprietary springs. Confirm compatibility with your specific trigger manufacturer if you are running a non-mil-spec trigger group.

Q: How often should AR lower springs be replaced?

A: Replace springs when they fail to perform their function or show visible damage. There is no set interval; inspect springs during regular cleaning and maintenance. High round counts, frequent disassembly, and hard use accelerate wear.

Q: Can I order the Rankin Industries AR15 Spring Kit from Western Sport?

A: Yes. Western Sport is located in Roanoke, Texas, and serves customers throughout North Texas and the DFW area. Call 817-393-4000 to place an order, ask about gunsmithing services, or get help selecting the right parts for your build.

Additional information