KAK AR-15 Missing Parts Kit
Not Yet Rated | Write the First Review SKU: 222-KAK-AR15-LP-KT-04
UPC: 811163000000
MFG#: AR15-LP-KT-04

Whether you're building a new AR-15 lower or just lost a spring to the carpet monster, our AR-15 Missing Lower Parts Kit ensures you're never stuck mid-build.

This compact, affordable kit contains the small, easy-to-lose components that always seem to vanish during installation or disassembly. It's not just a smart addition to your bench — it’s a must-have backup when things go “sproing.”

🧩 What’s in the Kit?

Our AR-15 spare parts kit includes commonly lost or damaged components that are essential for lower receiver function. Each part is mil-spec and built to exacting standards to ensure compatibility and reliability.

Kit includes:

• Takedown pin spring

• Pivot pin spring

• Buffer retainer

• Buffer retainer spring

• Bolt catch plunger

• Bolt catch spring

• Selector detent

• Selector detent spring

• Magazine catch spring

• Front detent

• Front detent spring

• Other critical small parts for your LPK

This is the perfect supplement to a standard AR-15 lower parts kit (LPK) — or a reliable way to replace that one part you launched across the garage.

🔩 Why Builders Love This Kit

• Saves time & headaches – No more halting your build over one missing spring.

• Compatible with all mil-spec AR-15 lowers

• Great for emergencies or prepping extra rifles

• Ideal for gunsmiths, hobbyists, and first-time builders

• Better than buying full LPKs repeatedly for just one missing part

🎯 Use Cases

• AR-15 builders finishing a lower

• Swapping furniture or triggers

• Cleaning or disassembling rifles

• Upgrading receivers

• Prepping bugout bags or range kits

🔒 Quality You Can Trust

At KAK Industry, we manufacture and test every component with the same attention to detail we put into our complete builds. These aren't surplus parts — they're high-grade replacements built for durability, fitment, and performance.

📦 Keep One in Your Toolbox

You won’t realize how valuable this kit is until you need it. Whether you're a seasoned armorer or just starting your first AR build, the Missing Lower Parts Kit saves time, frustration, and range days.

🙋 Frequently Asked Questions (FAQ)

❓ What’s the difference between this and a full LPK?

This kit is not a full lower parts kit. It only includes commonly lost or critical small parts — perfect for replacing missing pieces, not starting from scratch.

❓ Is it compatible with all AR-15 lowers?

Yes. All components are mil-spec and will work with any mil-spec AR-15 lower receiver, including most popular brands.

❓ Why is it called an “oops kit”?

“OOPS” is shooter slang for those moments when a spring or pin goes flying during assembly or cleaning. This kit is your fix.

❓ Do I need special tools to install these parts?

Basic AR-15 tools are helpful, but most parts in this kit can be installed with common tools like punches, a hammer, or a bench block.

❓ How many kits should I keep on hand?

We recommend keeping at least one per build bench or range bag. They're small, affordable, and worth it when you're stuck.

📌 Ready to Build? Stay Ready to Finish.

Don’t let one tiny missing part stop your entire project. Order your AR-15 Missing Lower Parts Kit today and keep your rifle — and your sanity — intact.