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CMMG
Overview
The CMMG AR-15 Carbine Receiver Extension Kit is a comprehensive parts kit designed for building or upgrading your AR-15. Featuring a Mil-Spec buffer tube, this assembly is specifically configured for carbine-length setups, ensuring compatibility with a wide range of stocks and enhancing overall functionality. This kit is commonly used in carbine builds, making it a reliable choice for those looking to streamline their assembly process.
Builders on GunPartPicker first added the CMMG AR15 Carbine Receiver Extension KIT to a build in March 2026.
It was in stock most days in August 2026, and today 6 of the 8 retailers we track have it in stock. It dipped to $49.89 at BattleHawk Armory for a stretch in August 2026, under its usual $55.19 to $92.99, so sales do come around. Buying today, the lowest price is $55.19 at Classic Firearms, above August's low of $49.89, so a better deal may come back.
Updated · from real builds on GunPartPicker · Prices checked · refreshed daily across 35 retailers
We ranked every buffer tube assembly by how often it shows up in real builds on GunPartPicker.
Read the guide: AR-15 Buffer Tube Assembly Guide →Check it against the live catalog:
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Builds in the community that include the Cmmg Ar15 Carbine Receiver Extension Kit
| Build | Parts | Total |
|---|---|---|
![]() | 24 | $1319.05 |
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