Wilson Combat Mil-Spec AR-15 Carbine Buffer Tube Kit / Super-Stoc Retro-Fit Kit

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Wilson Combat Mil-Spec AR-15 Carbine Buffer Tube Kit / Super-Stoc Retro-Fit Kit

Upgrade your AR-15’s recoil system with the Wilson Combat Mil-Spec Buffer Tube Kit. Designed for reliability and compatibility, this kit ensures smooth cycling and consistent performance under rapid fire. Whether you’re retrofitting an older build or assembling a new carbine, the hardened construction and precise tolerances meet the demands of range use and tactical applications. Ships nationwide with no FFL requirements.

Key Specifications

• Material: 7075-T6 aluminum buffer tube, hardened steel components
• Finish: Type III hardcoat anodized (matte black)
• Length: Carbine (6-position adjustable)
• Compatibility: Mil-spec AR-15 lower receivers
• Includes: Buffer tube, castle nut, end plate, carbine buffer spring, carbine buffer weight
• Weight: 8.2 oz (complete kit)

Feature Breakdown

The buffer tube is machined from 7075-T6 aluminum, the same alloy used in aircraft components, offering superior strength-to-weight ratio. Unlike commercial-spec tubes, the mil-spec diameter ensures compatibility with aftermarket stocks and avoids fitment issues. The Type III anodizing resists wear from repeated stock adjustments and harsh field conditions.

Included components are heat-treated to prevent deformation under sustained fire. The carbine buffer weight and spring are optimized for 5.56/.223 rifles, reducing bolt carrier group (BCG) bounce and improving follow-up shot consistency. The castle nut and end plate feature positive staking notches for secure attachment without thread-locking compounds.

This kit simplifies retrofitting older rifles with collapsible stocks or replacing worn recoil systems. The six-position adjustment accommodates shooters of all sizes and gear configurations, from plate carriers to minimalist range setups. No proprietary tools are required—installation aligns with standard armorer’s practices.

Wilson Combat’s reputation for tight tolerances means no wobble between the tube and lower receiver. The internal bore is honed to minimize spring friction, extending component life. Unlike budget kits, this assembly avoids the “twang” of poorly tuned springs during cycling.

Compatibility

Fits mil-spec AR-15/M4 carbine lowers. Compatible with most collapsible stocks (excluding proprietary designs like PDW stocks). Not intended for rifle-length buffer systems or pistol-caliber builds requiring specialized weights. Verify your lower’s rear cavity accepts mil-spec diameter tubes before ordering.

Installation Overview

Remove the existing buffer tube by unscrewing the castle nut (armorer’s wrench recommended). Clean receiver threads before installing the new tube hand-tight, then torque to 35–40 ft-lbs. Align the end plate’s sling loop forward and stake the castle nut at two points. Insert the spring and buffer weight, ensuring proper orientation. Test stock adjustment and BCG movement before live fire.

FAQ

Q: Does this work with a .300 Blackout build?
A: Yes, assuming standard carbine-length gas systems. Heavy buffer weights (not included) may be needed for suppressed fire.

Q: Is staking the castle nut mandatory?
A: Highly recommended to prevent loosening under recoil. Unstaked nuts may require periodic re-torquing.

Q: Will this fit a polymer lower?
A: Only if the lower is reinforced for mil-spec buffer tubes. Polymer threads may strip under torque.

Q: What’s the difference between this and commercial-spec tubes?
A: Commercial tubes have a larger diameter (1.17″ vs. mil-spec 1.14″), limiting stock options.

Q: Can I use an H2 buffer with this kit?
A: Yes, the tube accommodates all standard carbine buffers (H1, H2, H3).

Warranty & Shipping

Wilson Combat guarantees this kit against manufacturing defects for one year. Shipping to all 50 states—no signature required. Contiguous U.S. orders typically ship within 2 business days. Contact support for damaged/missing parts claims.

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