LBE Unlimited Mil-Spec Diameter Buffer Tube — 6-Position, AR-15, Black (Model MBUF002)

Upgrade the ergonomics, durability, and modularity of your AR-15 platform with the LBE Unlimited Mil-Spec Diameter Buffer Tube (Model MBUF002). Machined and finished for dependable service, this six-position buffer tube is a direct-fit Mil-Spec replacement designed for shooters who want a rugged, lightweight, and rock-solid mounting platform for adjustable stocks, improved sling geometry, and consistent cheek welds. Finished in matte black, the MBUF002 blends stealthy aesthetics with mil-grade function — perfect for tactical builds, range rifles, and precision platforms.

Key SEO Keywords

Mil-Spec buffer tube, AR-15 buffer tube, 6-position buffer tube, adjustable stock tube, black buffer tube, MBUF002, LBE Unlimited AR parts, AR-15 upgrades.

Precision Construction & Mil-Spec Compatibility

The LBE MBUF002 is manufactured to mil-spec diameter (1.148" nominal) and machined to tight tolerances so it accepts all standard 6-position Mil-Spec stocks and hardware. Built from high-strength aluminum alloy, the tube offers a perfect balance of light weight and structural strength. Whether you’re replacing a worn factory tube or upgrading for a new stock and sling setup, this tube provides consistent fitment and repeatable alignment with compatible receivers and components.

6-Position Adjustability for Versatile Shooting

Featuring six positive locking positions, this buffer tube lets you quickly dial in length of pull for different shooters, body armor, or shooting positions. The indexed detents give tactile feedback and secure the stock in place under recoil, improving comfort and control for both precision and rapid-fire scenarios. Ideal for multi-shooter households, competitions, or duty rifles where quick, repeatable adjustments matter.

Rugged Finish & Corrosion Resistance

The matte black finish on the MBUF002 resists wear, scratches, and corrosion, blending seamlessly with modern blacked-out builds and providing a non-reflective surface for tactical use. The coating process ensures long-lasting appearance and protects mating surfaces from galling during installation and repeated stock adjustments.

Design Features & Benefits

• Mil-Spec Diameter: Accepts industry-standard 6-position Mil-Spec stocks and endplates.

• 6 Positive Positions: Fine adjustment increments for precise length-of-pull and secure lockup.

• Lightweight Aluminum Construction: Durable yet weight-efficient for balanced rifle handling.

• Matte Black Finish: Low-glare, corrosion-resistant coating for long service life.

• Direct Drop-In Replacement: Simple swap for OEM tubes on AR-15 lowers with standard castle nut and endplate.

• Improved Sling Geometry: Works with single-point and two-point sling setups for better control and carry comfort.

• Enhanced Cheek Weld Repeatability: Helps maintain consistent sight picture and optic alignment across positions.

Technical Specifications

• Manufacturer: LBE Unlimited

• Model: MBUF002

• Application: AR-15 / AR-pattern rifles (Mil-Spec diameter)

• Positions: 6 indexed positions

• Material: High-strength aluminum alloy (CNC machined)

• Finish: Matte black corrosion-resistant coating

• Compatibility: Mil-Spec stocks, standard castle nut & endplate installation

• Use: Replacement / upgrade for adjustable stock mounting, sling mounting point

Installation Overview (Quick & Safe)

1. Safety first: Ensure the rifle is unloaded and the upper is removed per standard armorer procedures.

2. Remove castle nut & endplate: Use a wrench and appropriate tools to uninstall the existing tube assembly.

3. Slide on new tube: Position the MBUF002 onto the lower receiver extension boss.

4. Index & torque: Install the endplate and castle nut, time the sling endplate as required, and torque to manufacturer specs.

5. Fit stock & test: Attach your Mil-Spec 6-position stock, adjust through positions, and confirm secure lockup and smooth operation.

If you’re not comfortable performing this swap, consult a qualified armorer or gunsmith.

Tuning, Compatibility & Best Practices

• Pair the MBUF002 with Mil-Spec carbine stocks, QD endplates, and proper buffer/spring setups to optimize ergonomics and function.

• Check endplate and castle nut torque after initial firing; hardware can settle after first range sessions.

• When using heavy or permanently attached slings, consider a reinforced endplate or dedicated QD mount to avoid stress on the receiver extension boss.

• The tube is intended for Mil-Spec diameter accessories only — do not mix with proprietary commercial-diameter stocks without verifying fit.

Who Should Buy It?

• AR builders and hobbyists upgrading fit and finish on a custom build.

• Law enforcement and duty users looking for reliable, adjustable stock mounting.

• Competition shooters who need quick, repeatable length-of-pull settings.

• Anyone replacing a worn or damaged buffer tube with a mil-spec, drop-in solution.

Why Choose the LBE Unlimited MBUF002?

The LBE Unlimited Mil-Spec 6-Position Buffer Tube (MBUF002) provides a durable, precision-machined foundation for adjustable stocks and sling systems. With consistent mil-spec fitment, a secure 6-position detent system, and a corrosion-resistant matte black finish, it’s a smart, cost-effective upgrade that improves comfort, control, and modularity across AR-15 platforms. Built to perform and engineered for compatibility, the MBUF002 is the dependable tube for builders who demand mil-grade standards.

The End