Fortis Billet M4 Upper Stripped for AR15 223 Rem, 556 NATO - UBilletM4
Click to see full view
Fortis Manufacturing
Overview
The Fortis Billet M4 Upper Stripped receiver is designed for the AR-15 platform and is crafted from billet aluminum, providing a robust and precise foundation for your build. This upper is chambered in .223 Wylde, allowing for optimal versatility between .223 Remington and 5.56 NATO cartridges. It’s commonly used in builds that feature a mid-length gas system, making it a solid choice for those looking to balance performance and reliability in their rifle setup.
Specifications
Fortis Billet M4 Upper Stripped for AR15 223 Rem, 556 NATO - UBilletM4
Available Merchants(5)
Prices checked
Stock Alert
October 2026 on GunPartPicker
Fortis Billet M4 Upper Stripped for AR15 223 Rem, 556 NATO - UBilletM4 ranked #360 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 #161 of the 2,068 upper receivers builders have added. Builds with this upper receiver are nearly all chambered in .223 Wylde, split between mid-length (39%) and pistol-length (23%) gas systems, and nearly all AR-15.
It was hard to find in October 2026, in stock on only 8 of the 22 days we checked, and today none of the 5 retailers we track has it in stock right now. Listed prices start at $189.95 at Optics Planet for when it comes back.
Updated · from real builds on GunPartPicker · Prices checked · refreshed daily across 37 retailers
Not sure which upper receiver to pick?
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:
Frequently Built With
The part most often added in each category by the builds that include this one
Fortis Manufacturing License Gen 2 AR-15 Stripped Lower Receiver Black
ODIN Works O2 Lite M-LOK Free Float AR-15 Handguard - 7.5"
Radian Raptor Charging Handle & Talon Safety Selector Combo - OD Green
FAXON Firearms Suppressor Optimized Barrel 300BLK 7.5" Pistol Length Black
Fail Zero 6.5 Grendel Type II AR-15 Bolt Carrier Group - No Hammer
WMD Guns AR-15 Gas Tube Nitromet Mid-Length
Build Configuration Breakdown
Aggregated and anonymized data showing how builders use 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 Fortis Billet M4 Upper Stripped for AR15 223 Rem, 556 NATO - UBilletM4
| Build | Parts | Total |
|---|---|---|
 | 14 | $2087.04 |
 | 22 | $1951.79 |
 | 16 | $1642.44 |
No reviews yet. Be the first to review this product!