What is included in an AR-15 Buffer Tube Kit?

A buffer tube kit typically includes a buffer tube, recoil spring, buffer, castle nut, and end plate. Some include sling plates or enhanced components.

Can I use this kit for my AR pistol?

Yes. We offer pistol buffer tube kits compatible with most AR pistol builds and stabilizing braces.

What’s the difference between Mil-Spec and Commercial buffer tubes?

Mil-spec tubes have a 1.14” diameter with tighter tolerances, while commercial tubes are slightly larger at 1.17” and have a slanted rear.

AR-15 Buffer Tube Kit | Complete Mil-Spec & Commercial Kits

Name: AR-15 Buffer Tube Kit
Brand: Mounts Plus
Availability: InStock

**Deltac AR-15 Mil Spec Buffer Tube Kit with Dual Loop Sling End Plate** $79.92

**ATI AR-15 Mil-Spec Buffer Tube Package** $63.12

**ATI AR-15 Buffer Tube Commercial Package** $66.65

**ATI AR-15 Pistol Buffer Tube Assembly** $63.12

**Timber Creek Carbon Fiber Buffer Tube - Mil-Spec AR-15 Buffer Tube Kit** $71.99

**AR15 Enhanced Carbine Buffer Kit – Kodiak Brown Anodized** $76.99

**Aero AR15 Enhanced Carbine Buffer Kit** $76.99

**Aero AR-10 Enhcd Carb Buffer Kit Kbrn** $104.99

**Aero Ar15 Enhcd Carb Buffer Kit Odg** $76.99

**Aero AR-10 Enhcd Carb Buffer Kit Odg** $104.99

**BCM Milspec Carbine Stock Hardware MOUNTING KIT (Mil-Spec)** $58.74

**CMC Triggers AR-15 Mil-Spec Carbine Buffer Tube Kit – Enhanced QD** $59.27

**Luth-AR Mil-Spec Carbine Buffer Assembly – .223/5.56** $49.66

**Luth-AR 308 Carb Bfr Tube Assembly Mil** $76.60

**Luth-AR .223/5.56 Rifle Buffer Tube Assembly – A2** $54.48

**Luth-AR 308 Rfl/fxd Bfr Tube Assy** $65.75

**Luth-AR 9mm Carbine Buffer Assembly** $51.65

**Armaspec Carb Bff Tube Kit W/ Ep/cn** $39.83

**San Tan Tactical AR-15 Enhanced Buffer Tube Kit | Carbine | 6-Position** $97.41

AR-15 Buffer Tube Kit – Mil-Spec & Commercial Kits for Rifle & Pistol Builds

Looking to build or upgrade your AR-15? Start with a high-performance AR-15 Buffer Tube Kit—the heart of your rifle’s recoil system. At Mounts Plus, we carry complete buffer tube kits for mil-spec, commercial, rifle-length, and pistol builds, trusted by shooters across the country.

Each kit includes the critical parts for a smooth, secure install: buffer tube, recoil spring, carbine buffer, castle nut, and end plate—everything you need for a rock-solid foundation.

✅ Why You Need a Complete AR-15 Buffer Tube Kit

Whether you're building from scratch or upgrading an OEM part, a complete buffer tube kit ensures:

🔩 Proper cycling and recoil control
🛠️ Secure stock or brace attachment
🧱 Compatibility with mil-spec or commercial stocks
⚙️ Simplified installation – all parts in one kit

📦 What’s Included in Our Buffer Tube Kits?

Every AR-15 buffer tube kit includes:

✅ 1x Buffer Tube (Mil-Spec or Commercial)
✅ 1x Carbine Recoil Spring
✅ 1x Carbine Buffer
✅ 1x Castle Nut
✅ 1x End Plate (standard or QD sling mount)

Some kits also include enhanced buffers, carbon fiber tubes, or upgraded sling attachments.

📊 Compare Our Top AR-15 Buffer Tube Kits

Product Name	Tube Spec	Type	Includes Spring & Buffer	Price
ATI Mil-Spec AR-15 Buffer Tube Kit	Mil-Spec	Carbine	✅ Yes	$63.12
Aero Precision Enhanced Buffer Kit	Mil-Spec	Carbine	✅ Yes	$80.28
Timber Creek Carbon Fiber Buffer Kit	Mil-Spec	Carbine	✅ Yes	$71.99
Luth-AR Rifle-Length Buffer Kit	Rifle	Fixed Stock	✅ Yes	$65.00
Deltac Pistol Buffer Tube Assembly	Pistol	Pistol Build	✅ Yes	$63.12

Compatible with AR-15 lowers, pistol builds, and most standard stocks.

🔩 Mil-Spec vs. Commercial Buffer Tubes

Mil-Spec:

Diameter: 1.14"
Tighter tolerances
Compatible with premium stocks (Magpul, B5, BCM)

Commercial:

Diameter: 1.17"
Slightly slanted rear
Fits basic or commercial-only stock models

Always match your stock and tube spec for best results.

🧰 Use Cases

🔫 Rifle Builds – Use our mil-spec or rifle-length kits for DMRs, 3-gun rifles, or tactical setups.
⚖️ AR Pistols – Lightweight pistol buffer kits support braces or minimalist builds.
🔧 Stock Swaps – Upgrading from commercial to mil-spec? Our kits give you all the right components in one box.

❓ Frequently Asked Questions (FAQs)

What is an AR-15 Buffer Tube Kit used for?

It’s used to mount your stock or pistol brace, manage recoil, and allow smooth operation of your AR’s bolt carrier group.

How do I know if I need a mil-spec or commercial kit?

Mil-spec is standard for most modern AR-15 builds. Check your stock diameter or markings if unsure.

Can I use this on my AR pistol?

Yes! We offer pistol-specific buffer tube kits designed to work with stabilizing braces.

Will this kit work with a fixed A2 stock?

Yes, if you select a rifle-length buffer kit, it will work with fixed stocks like the A2 or Luth-AR MBA.

🛒 Shop AR-15 Buffer Tube Kits at Mounts Plus

Mounts Plus offers the best selection of buffer tube kits to fit any AR-15 setup. Whether you’re a competitive shooter or home builder, our kits deliver unmatched value and performance.

✅ Mil-Spec, Commercial, Rifle & Pistol kits
✅ USA-made options from Aero Precision, ATI, Timber Creek
✅ Complete parts for fast, easy installation
✅ Expert customer support
✅ Fast shipping from our U.S. warehouse