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The CMMG A1 Receiver Extension gives your build the foundation it needs for a rifle-length setup with a traditional fixed stock. Made from black hardcoat anodized aluminum, this tube is built to handle the demands of a working rifle while maintaining that clean, classic aesthetic.
This is a straightforward, no-frills component. It's designed to work with fixed A1 or A2 stocks and integrates with standard lower receivers on AR-15, M16, M4, and LR-308 platforms. The hardcoat anodized finish gives you solid corrosion resistance without the fuss. If you're building a rifle with an 18" or 20" barrel and want a true rifle-length buffer system, this is what you need.
Rifle-length receiver extensions are longer than carbine versions, which means they require their own dedicated buffer and spring setup. This tube pairs with a rifle-length buffer and spring, not the lighter carbine components. The key thing here is understanding that once you go with a rifle-length tube, your stock selection narrows to fixed options like the A1 or A2 models. You won't be able to run a collapsible M4-style stock on this.
If you're swapping from a carbine setup or building from scratch, you'll be threading this onto your lower receiver like any standard buffer tube. It's mil-spec dimensioned, so compatibility with quality parts from established manufacturers is reliable. This is the kind of part that just works when you need it to.
Rifle-length tubes like this A1 extension are significantly longer than carbine versions and are designed for fixed stocks. The extra length requires a dedicated rifle-length buffer and spring setup, not the lighter carbine components. You also can't use adjustable M4-style stocks with this tube, only fixed A1 or A2 models.
Yes, as long as your lower is mil-spec dimensioned. This extension is compatible with standard AR-15, M16, M4, and LR-308 platforms. Just verify your lower receiver is designed for a rifle-length buffer system before ordering, as carbine and rifle-length setups aren't interchangeable.
Yes. This tube alone is just one part of the system. You'll also need a rifle-length buffer, a rifle-length buffer spring, a castle nut, and an end plate to complete the setup. Many builders buy these components as part of a complete kit to ensure everything matches and works together properly.
The hardcoat anodized finish is designed for corrosion resistance and regular handling. Like all anodized finishes, it can develop a patina over time with heavy use, but this is normal and doesn't affect function. Avoid storing in damp conditions for extended periods to maintain the finish.
| UPC | 815835017334 |
|---|---|
| Manufacturer | |
| Manufacturer Part Number | 55CA9B7 |
| Shipping Weight | 0.23 |
| Style | A1 |
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