LBE Unlimited AR-15 Mil-Spec Buffer Tube Gray
LBE Unlimited
$22.69
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LBE Unlimited
LBE Unlimited AR-15 Mil-Spec Buffer Tube Gray
The LBE Unlimited AR Mil-Spec Buffer Tube in Colt Gray is a precision-machined carbine receiver extension built to exact mil-spec diameter standards, giving your AR-15 build a reliable, drop-in-ready foundation for any collapsible stock.
- Mil-spec diameter ensures compatibility with a wide range of collapsible AR-15 stocks
- Six-position design allows full adjustment for length of pull
- Colt Gray anodized finish blends seamlessly with standard AR furniture
- Pre-threaded for straightforward installation — no extra machining required
- Made in the USA by LBE Unlimited, a trusted name in AR components
- Ideal as a build component or a reliable addition to your spare parts kit
Who This Is For
This buffer tube is the right choice for AR-15 builders, gunsmiths, and enthusiasts who need a dependable, mil-spec carbine receiver extension at an accessible price point. Whether you're assembling a new rifle, replacing a worn tube, or stocking spare parts for the range, the LBE Mil-Spec Buffer Tube delivers consistent quality without compromise — and its Colt Gray finish makes it a natural fit for classic or duty-inspired builds.
Specifications
| Brand | LBE Unlimited |
|---|---|
| Model | AR Mil-Spec Buffer Tube |
| Finish | Colt Gray Anodized |
| Diameter | Mil-Spec (1.148") |
| Positions | 6-Position |
| Type | Carbine Receiver Extension |
| Threading | Pre-Threaded, 1-3/16" x 16 TPI |
| Compatibility | AR-15 Mil-Spec Collapsible Stocks |
| Country of Origin | USA |
Frequently Asked Questions
What is the difference between a mil-spec and commercial buffer tube?
A mil-spec buffer tube has a slightly smaller outer diameter (approximately 1.148") and a straight profile, while a commercial tube has a larger diameter (approximately 1.170") and a slight taper. These two standards are not interchangeable, so it's important to match your buffer tube to your stock. The LBE AR Mil-Spec Buffer Tube is designed for stocks requiring a mil-spec diameter — the more common standard used in military and high-quality aftermarket AR-15 builds.
Does this buffer tube come with a buffer, buffer spring, or castle nut?
This listing is for the buffer tube (carbine receiver extension) only. A buffer, buffer spring, and castle nut/end plate are typically sold separately. If you're doing a complete lower build, be sure to source a carbine-length buffer and spring rated for your intended use — standard carbine, H, H2, or H3 buffers are all compatible with this mil-spec tube.
Will this buffer tube work with my AR-15 pistol or SBR build?
Yes — this mil-spec diameter carbine receiver extension is compatible with AR-15 pistol builds using a pistol brace as well as short-barreled rifle (SBR) configurations, provided the stock or brace you're using is designed for a mil-spec tube. Always verify that your chosen stock or pistol brace specifies mil-spec diameter compatibility before ordering.
