CMMG AR15 Carbine Receiver Extension KIT
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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.
Specifications
Available Merchants(7)
Prices checked
Price Alert
October 2026 on GunPartPicker
CMMG AR15 Carbine Receiver Extension KIT ranked #41 of the 107 buffer tube kits builders added on GunPartPicker in October 2026. Builders have added it to their builds on GunPartPicker. Since April 2026, it ranks #89 of the 213 buffer tube kits builders have added.
Availability is good: it was in stock at one retailer or another nearly every time we checked in October 2026, and today 5 of the 7 retailers we track have it in stock. The best price crept up from $55.19 to $58.14 over October 2026. Buying today, the lowest price is $58.14 at Classic Firearms, above October's low of $55.19, so a better deal may come back.
Updated · from real builds on GunPartPicker · Prices checked · refreshed daily across 37 retailers
Not sure which buffer tube assembly to pick?
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:
Frequently Built With
The part most often added in each category by the builds that include this one
Yankee Hill Machine .223 Rem/5.56 Flat Top Stripped Upper Receiver, Hardcoat Anodized Matte Black - 110
Black Rain Ordnance BRO-22 Receiver .22 LR Billet Lower, 6061-T6 Aluminum, Integral Picatinny Rail
Luth-AR Mba-5 Carbine Buttstock Assembly - Black
Strike Industries Arch AR-15 Charging Handle Extended Latch - FDE
Strike Industries AR-15 Rubber Overmold Pistol Grip 20-Degree Black
Rise Armament Super Sporting Trigger Single Stage Flat, Black/White - RA-140F-LFOD-AWP
Build Configuration Breakdown
Aggregated and anonymized data showing how builders use this product
PlatformBased on real build data showing which platform (AR-15, AR-10, AR-9) builders pair with this product.
CaliberBased on real build data showing which calibers builders choose alongside this product.
Gas SystemBased on real build data showing which gas system lengths builders use with this product.
Builds Featuring This Part
See all builds →Builds in the community that include the Cmmg Ar15 Carbine Receiver Extension Kit
| Build | Parts | Total |
|---|---|---|
 | 24 | $1613.42 |
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