LBE Unlimited AR-15 Mil-Spec Buffer Tube Kit — Colt Gray (MILBUFKT-CG | MILBUFKTCG | UPC 706612407762)
Upgrade your AR-15 the right way with the LBE Unlimited Mil-Spec Buffer Tube Kit in classic Colt Gray. This complete kit includes everything you need for a reliable receiver extension assembly—buffer tube, recoil spring, castle nut, receiver end plate, and recoil buffer—engineered to mil-spec dimensions for dependable performance with standard mil-spec carbine stocks.
Why This Kit?
True mil-spec diameter receiver extension for broad compatibility with mil-spec carbine stocks (not commercial-spec).
Colt Gray finish for a timeless, duty-ready look that pairs perfectly with classic builds and modern clones.
Complete solution out of the box—no hunting for small parts or mismatched finishes.
Brand you can trust: LBE Unlimited is known for building hard-use components that just work.
What’s Included
Mil-Spec Carbine Buffer Tube (Receiver Extension) — mil-spec outer diameter for secure stock fit.
Carbine Recoil Spring — optimized for standard carbine operation.
Carbine Recoil Buffer — tuned for reliable cycling with typical 5.56/.223 carbine setups.
Castle Nut — locks the extension in place once torqued and staked.
Receiver End Plate — standard end plate ready for staking; accepts QD/adapter solutions if you choose to upgrade.
Compatibility: Designed for the AR-15 platform with mil-spec carbine stocks and standard lower receivers. Works with most 5.56/.223 carbine-length gas systems and comparable configurations. Always verify compatibility with your specific components.
Key Features & Benefits
Reliability First: Mil-spec dimensions help ensure correct geometry for smooth cycling, consistent lock-up, and fewer malfunctions.
Consistent Recoil Impulse: The included carbine buffer and spring provide a familiar, controllable recoil feel for fast follow-up shots.
Secure Lock-Up: Castle nut and end plate are ready to stake after final torque to keep the extension from backing out under hard use.
Clean, Uniform Finish: Colt Gray anodized look ties your receiver set, upper, and furniture together for a cohesive build.
Easy, Straightforward Install: A quality armorer’s wrench, thread prep, and proper torque/staking are all you need. (Follow your manufacturer’s torque values and best practices.)
Ideal Uses
New Builds: Start your lower the right way with matched, mil-spec parts.
Refresh/Replace: Solve weak springs, odd buffer weights, or worn receiver extensions in aging carbines.
Clone Correct Aesthetics: Nail the classic Colt Gray appearance on duty-style or retro-inspired rifles.
Installation Tips (Best Practices)
Prep Threads: Clean and degrease receiver threads; apply a small amount of quality thread treatment if recommended by your armorer’s procedures.
Align & Torque: Time the buffer tube to capture the buffer retainer correctly; torque the castle nut per manufacturer guidance.
Stake the Castle Nut: Use a center punch to displace metal from the end plate into the castle nut notch after torqueing.
Function Check: Verify safety selector, trigger reset, bolt hold-open, and buffer movement before live fire.
Note: If you’re running non-standard calibers, exotic gas systems, suppressors, or tuned BCGs, you may choose a different buffer weight or spring rate to optimize dwell and ejection. This kit provides a proven, general-purpose baseline for standard carbine setups.
Specifications
Brand: LBE Unlimited
Platform: AR-15 carbine
Receiver Extension: Mil-spec diameter, carbine-length
Finish/Color: Colt Gray
Included Parts: Buffer tube, carbine recoil spring, castle nut, receiver end plate, carbine recoil buffer
Model Numbers: MILBUFKT-CG, MILBUFKTCG
UPC: 706612407762
FAQs
Q: Will this work with commercial-spec carbine stocks?
A: It’s made to mil-spec diameter. Use it with mil-spec carbine stocks for proper fit.
Q: Which buffer weight is included?
A: The kit includes a standard carbine recoil buffer suitable for typical 5.56/.223 carbine builds. If your setup is suppressed or over-/under-gassed, consider tuning with a different buffer weight.
Q: Do I need to stake the castle nut?
A: Yes—staking after torque helps prevent the castle nut from loosening under recoil and is considered best practice for duty or defensive rifles.
Q: Can I use this with a pistol-caliber carbine (PCC)?
A: Many PCCs use different buffer weights and sometimes different springs. Verify your manufacturer’s requirements before installation.
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Compliance & Safety
Know Your Local Laws: Ensure ownership and configuration comply with all federal, state, and local regulations.
Gunsmithing Caution: If you’re unsure about installation, consult a qualified armorer or gunsmith. Always perform a full function/safety check before use.
Meta For Your Product Page
Meta Title: LBE Unlimited AR-15 Mil-Spec Buffer Tube Kit — Colt Gray | MILBUFKT-CG MILBUFKTCG
Meta Description: Complete AR-15 mil-spec buffer tube kit by LBE Unlimited in Colt Gray. Includes buffer tube, carbine recoil spring, castle nut, receiver end plate, and recoil buffer. Model MILBUFKT-CG / MILBUFKTCG — UPC 706612407762.
Bring reliability, compatibility, and that iconic Colt Gray finish to your next AR-15 build with the LBE Unlimited Mil-Spec Buffer Tube Kit—a complete, no-nonsense solution for smooth cycling and secure stock fit.
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