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CMMG
Overview
The CMMG Banshee 5.7x28mm Upper features a 5-inch barrel, designed to deliver high-velocity performance in the compact AR-15 platform. As a complete assembly, it simplifies the build process while allowing you to chamber the popular 5.7x28mm caliber, which is known for its flat trajectory and low recoil. This upper is often found in builds aimed at maximizing maneuverability and rapid target acquisition, making it a solid choice for those interested in a lightweight, high-performance setup.
Specifications
CMMG Banshee 5.7x28mm Upper with 5" Barrel, Black - 57BBCF0AB
Available Merchants(5)
Prices checked
Price Alert
October 2026 on GunPartPicker
CMMG Banshee 5.7x28mm Upper with 5" Barrel, Black - 57BBCF0AB ranked #170 of the 844 upper receivers builders added on GunPartPicker in October 2026. Builders have added it to their builds on GunPartPicker. Since April 2026, it ranks #108 of the 2,053 upper receivers builders have added. Builds with this upper receiver are nearly all chambered in 5.7x28mm, nearly all on pistol-length gas, and nearly all AR-15.
Availability is good: it was in stock at one retailer or another nearly every time we checked in October 2026, and today 3 of the 5 retailers we track have it in stock. Prices barely moved in October 2026, holding around $768.99, with no real sale all month. Buying today, the lowest price is $768.99 at Ammunition Depot, which matches the best price we saw in October.
Updated · from real builds on GunPartPicker · Prices checked · refreshed daily across 37 retailers
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Read the guide: Most Popular AR-15 Upper Receivers →Check it against the live catalog:
Frequently Built With
The part most often added in each category by the builds that include this one
Sharps Bros Showdown Stripped Lower Receiver - Black, Unique Design and High-Performance for Custom AR Builds - SBLR11
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Radian Raptor Charging Handle & Talon Safety Selector Combo - OD Green
San Tan Tactical Enhanced AR-15 Bolt Carrier Group - 5.56 - Nitride
Fortis SHIFT Vertical Grip - M-LOK
Timber Creek Enforcer AR Pistol Grip, Black - E ARPG Black
Builds Featuring This Part
See all builds →Builds in the community that include the CMMG Banshee 5.7x28mm Upper with 5" Barrel, Black - 57BBCF0AB
| Build | Parts | Total |
|---|---|---|
 | 8 | $1303.55 |
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