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AR-15 Buffer Tube – Mil-Spec, Commercial, Rifle & Pistol Kits

Looking to build, upgrade, or repair your AR-15? Start with a high-quality AR-15 Buffer Tube—a critical component for recoil management, stock attachment, and overall reliability. At Mounts Plus, we carry a complete selection of mil-spec, commercial, rifle-length, and pistol buffer tubes, along with full buffer tube kits for new builds or replacements.

All our buffer tubes are made by top brands including ATI, Aero Precision, BCM, UTG PRO, Timber Creek, and Luth-AR—and we ship fast across the U.S.

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✅ Why the AR-15 Buffer Tube Matters

The buffer tube (also called the receiver extension) houses the buffer and recoil spring, absorbing recoil and ensuring reliable cycling. It also supports the attachment of collapsible or fixed stocks, making it a vital part of any AR platform.

Benefits of Choosing the Right Tube:

• ⚙️ Improves reliability – smooth cycling and bolt reset

• 🔧 Ensures stock compatibility – mil-spec vs commercial fit

• 🎯 Supports accuracy – especially on rifle-length builds

• 🧲 Allows customization – pistol tubes, adjustable stocks, or fixed options

• 🇺🇸 Made in the USA – many of our tubes are built to military standards

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📦 Types of AR-15 Buffer Tubes We Offer

🔩 Mil-Spec Buffer Tubes

• Diameter: 1.14”

• Flat back, tighter tolerances

• Compatible with most high-end AR-15 stocks (Magpul, B5, UTG PRO)

🔩 Commercial Buffer Tubes

• Diameter: 1.17”

• Slanted back

• Fit commercial-spec stocks or entry-level rifle builds

🧱 Rifle-Length Buffer Tubes (A2)

• Fixed-length tubes for A2 or DMR stocks

• No collapsible feature – ideal for precision shooting

🔫 Pistol Buffer Tubes

• Designed for AR pistol builds

• Smooth or dimpled exterior for stabilizing braces

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📊 Popular AR-15 Buffer Tubes & Kits

Browse kits or standalone tubes depending on your build needs.

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🔧 What’s in a Buffer Tube Kit?

Looking to replace or build from scratch? Our AR-15 buffer tube kits include:

• Buffer tube (mil-spec or commercial)
• Castle nut
• End plate
• Recoil spring
• Carbine buffer (or rifle buffer for A2 builds)

This is everything you need to attach a stock and ensure your rifle cycles properly.

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🛠️ Fit & Compatibility

All buffer tubes are compatible with:

• AR-15 lowers (mil-spec or commercial)
• AR-15 pistol lowers (for pistol tubes)
• Stocks designed for your tube spec (mil-spec vs commercial)
• Bolt carrier group and spring appropriate for barrel length

If you're unsure about fit, our team is ready to help you match parts to your rifle.

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❓ Frequently Asked Questions

What’s the difference between a mil-spec and commercial buffer tube?

Mil-spec tubes have a 1.14” diameter and a flat back. Commercial tubes are 1.17” in diameter with a slanted end. They are not cross-compatible.

Can I use a pistol buffer tube with a standard AR-15 stock?

No. Pistol tubes are made for stabilizing braces or minimalist builds. They don’t have notches for adjustable stocks.

Should I buy a kit or just the tube?

Buy a buffer tube kit if you’re building a rifle or replacing worn parts. Kits ensure all components fit properly.

Are your tubes made in the USA?

Many of our buffer tubes are U.S.-made and comply with mil-spec manufacturing standards.

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🛒 Shop AR-15 Buffer Tubes at Mounts Plus

Mounts Plus is your trusted source for AR-15 buffer tubes, whether you need a full kit or just a new tube. With top-rated brands, fast shipping, and expert service, we make it easy to get the right fit.

✅ Mil-Spec, Commercial, Rifle, and Pistol tubes
✅ Lightweight & carbon fiber options
✅ Full kits available
✅ Made in the USA (select models)
✅ Expert support & fast U.S. shipping