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ZRODelta
Overview
The ZRO Delta AR-15 Forged M4 Stripped Upper Receiver is designed for builders looking to create a robust and reliable platform, specifically tailored for the 5.56 NATO caliber. As a stripped receiver, it provides the essential foundation for your upper assembly, allowing you to customize it with your choice of components. This upper is commonly used in builds featuring a carbine gas system, making it a versatile choice for various applications.
Prices checked
ZRODelta Zro Delta AR-15 Forged M4 Stripped Upper Receiver ranked #267 of the 615 upper receivers builders added on GunPartPicker in September 2026. Builders have been adding it to their builds on GunPartPicker since June 2026. All time, it ranks #552 of the 1,854 upper receivers builders have added. Builds with this upper receiver are nearly all chambered in 5.56 NATO, mostly on carbine-length gas (65%, then mid-length 17%), and nearly all AR-15.
Availability is good: it was in stock at one retailer or another nearly every day in September 2026, but today the one retailer we track is out of stock. Prices barely moved in September 2026, holding around $719.99, so there haven't been real sales lately. Listed prices start at $719.99 at Brownells for when it comes back.
Updated · from real builds on GunPartPicker · Prices checked · refreshed daily across 37 retailers
We ranked every upper receiver by how often it shows up in real builds on GunPartPicker.
Read the guide: Most Popular AR-15 Upper Receivers →Check it against the live catalog:
The part most often added in each category by hundreds of builds that include this one
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Zro Delta AR-15 Fire Control Group Laser Cut Disconnector
Aggregated and anonymized data showing how builders use this product
Builds in the community that include the Zro Delta Ar-15 Forged M4 Stripped Upper Receiver
| Build | Parts | Total |
|---|---|---|
 | 26 | $3217.99 |
 | 12 | $1014.07 |
 | 10 | $1494.87 |
 | 18 | $1533.83 |
 | 32 | $7100.16 |
| 24 | $3983.32 |
 | 27 | $2093.63 |
 | 9 | $1489.90 |
| 12 | $1178.43 |
 | 16 | $1293.63 |
 | 21 | $2024.75 |
 | 11 | $1477.54 |
1 global rating
Top reviews
ZRO Delta forged M4 stripped upper has clean machining and consistent anodize. M4 feed ramps cut correctly. Forward assist and dust cover holes are dimensionally correct. Mates to my Aero lower with zero play. Solid mid-tier upper.
