LBE Unlimited Mil-Spec Buffer Tube – 6-Position AR-15, Gray | MBUF002CG | UPC 706612407694

Upgrade your AR-15 with a tough, dependable mil-spec buffer tube engineered by LBE Unlimited. The MBUF002CG is a 6-position carbine receiver extension finished in sleek gray for a subtle, modern look that pairs cleanly with black, FDE, or two-tone builds. Built to true mil-spec diameter for broad stock compatibility and consistent fit, this tube is a rock-solid foundation for your next rifle or pistol configuration.

Why Choose the LBE Unlimited MBUF002CG?

• Mil-spec dimensioning for maximum compatibility with popular collapsible stocks

• 6-position adjustability to dial in length of pull for shooters of different sizes, gear, and shooting positions

• Durable construction designed to withstand hard use and high round counts

• Clean Gray finish that resists wear and complements modern AR colorways

• AR-15 platform ready—ideal for builds, refreshes, or replacing worn components

Key Features

• Platform: AR-15 (carbine-length receiver extension)

• Diameter: Mil-spec (approx. 1.148")—works with mil-spec pattern stocks

• Positions: 6 (fast, repeatable LOP adjustments)

• Finish/Color: Gray—neutral, low-glare aesthetic

• Construction: Aluminum receiver extension with reinforced threading for reliable castle nut torque

• Identifiers: Model/SKU MBUF002CG • UPC 706612407694

Fitment Tip: Mil-spec tubes are not the same diameter as commercial tubes. Verify your stock is mil-spec or choose a mil-spec stock for the best fit.

Build & Performance Advantages

• Consistent stock fit: Mil-spec sizing helps prevent wobble and ensures positive lock-up across quality stocks.

• Smooth cycling: Precisely machined internal bore promotes consistent buffer movement and reliable return-to-battery.

• Rigid mounting: Correct thread profile mates securely to the lower receiver; supports precise alignment of the end plate and castle nut.

• Weather-resistant finish: Gray anodized coating fights corrosion and abrasion for long service life.

Ideal Uses

• Duty/defense setups requiring rugged parts that hold zero and survive real-world abuse

• 3-Gun & competition rifles where fast stock adjustments and reliable cycling matter

• Hunting & field carbines that benefit from tunable length of pull across layers and seasons

• General upgrades when replacing out-of-spec or worn receiver extensions

What’s Typically Needed (Not Included)

• Carbine buffer & spring (select weight to match your gas system/ammo)

• End plate & castle nut (stake after final torque for duty-grade security)

• Armorer’s wrench and torque wrench for proper installation

Installation Notes

1. Ensure the firearm is unloaded; remove upper from lower.

2. Thread the buffer tube into the lower receiver, capturing the buffer retainer and spring.

3. Align end plate, maintain takedown detent spring tension, and torque the castle nut to spec.

4. Stake the castle nut in two places for long-term security.

5. Function check: verify stock positions, buffer retention, and smooth charging.

Technical Specs (Quick Reference)

• Brand: LBE Unlimited

• Product: Mil-Spec Carbine Buffer Tube / Receiver Extension

• Compatibility: AR-15 lowers (carbine system), mil-spec diameter stocks

• Positions: 6

• Color: Gray

• Material: Aluminum receiver extension

• SKU: MBUF002CG

• UPC: 706612407694

Frequently Asked Questions

Q: Will this tube work with my commercial-spec stock?
A: It’s mil-spec diameter. Pair it with a mil-spec stock for proper fit and lock-up.

Q: Is this for rifle or carbine systems?
A: It’s a carbine-length receiver extension designed for carbine buffers and springs.

Q: What color gray is it?
A: A neutral, anodized gray that blends well with black, FDE, OD green, and other modern finishes.

Q: Do I need to stake the castle nut?
A: For hard-use or defensive rifles, yes—staking helps prevent the nut from backing out under recoil.

Q: Does it include the buffer, spring, or stock?
A: No. This listing is for the buffer tube only. Add a carbine buffer, spring, end plate, and castle nut to complete the assembly.

SEO-Optimized Highlights

• LBE Unlimited mil-spec buffer tube for AR-15

• 6-position carbine receiver extension, gray finish

• MBUF002CG, UPC 706612407694

• Mil-spec diameter for broad stock compatibility

• Ideal for builds, upgrades, and replacements

• Durable aluminum construction, smooth cycling, secure castle-nut engagement

Build It Right from the Foundation

Choose the LBE Unlimited Mil-Spec Buffer Tube, 6-Position, Gray (MBUF002CG) for reliable fitment, smooth operation, and a modern finish that elevates your AR-15 build from the first component you install.

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