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AeroPrecision
The Aero Precision EPC-9 9mm assembled upper receiver with 8.3" barrel and 7.3" handguard is a complete, ready-to-run upper built for 9mm AR pistol and rifle builds. This is a purpose-built upper for shooters wanting to run 9mm through a modern, reliable platform—whether you're setting up a short-barreled pistol, SBR, or plinking rifle. It comes fully assembled and threaded for a suppressor or muzzle device, so you're just a BCG and charging handle away from a functioning firearm.
The EPC-9 upper receiver is purpose-designed for 9x19 ammunition and features a last-round bolt hold-open mechanism that keeps the bolt locked back after the final round—a quality-of-life feature that makes unloading and chamber checking safer and faster. The receiver accepts most standard AR15 barrel nuts and handguards and includes Aero's proprietary ATLAS mounting system, which balances weight savings with solid attachment strength. Dimensioning and machining are dialed for proper handguard timing, and the upper uses standard AR15 takedown and pivot pin lugs for drop-in compatibility with most lower receivers.
The included ATLAS R-ONE handguard is a lightweight, skeletonized design that doesn't skimp on rail real estate. It runs a full-length Picatinny rail across the top for optics, lights, or other furniture, and includes quick-disconnect sling sockets at 3, 6, and 9 o'clock positions. The handguard has a 1.3" inside diameter and 1.5" outside diameter—slim enough to stay out of the way but rigid enough to handle whatever you mount. The 8.3" 9mm chrome-moly vanadium barrel is threaded 1/2"x28 (standard for 9mm suppressors) and finished with QPQ corrosion-resistant treatment inside and out.
Note: This upper does not include a bolt carrier group or charging handle, and the muzzle device is not pinned or welded, so you'll need to add those components separately. The barrel chamber is 9x19 Parabellum only.
| Brand | Aero Precision |
| Upper Receiver Type | EPC-9 (9mm-specific) |
| Barrel Length | 8.3" |
| Barrel Material | Chrome Moly Vanadium (CMV) |
| Barrel Finish | QPQ corrosion-resistant |
| Chamber | 9x19 Parabellum |
| Barrel Twist | 1 in 10 |
| Muzzle Threading | 1/2"x28 (standard 9mm) |
| Handguard | ATLAS R-ONE, 7.3" length |
| Handguard ID/OD | 1.3" ID / 1.5" OD |
| Top Rail | Full-length Picatinny |
| Sling Sockets | Quick-disconnect at 3, 6, and 9 o'clock |
| Receiver Material | 7075-T6 aluminum (forged) |
| Receiver Features | Last-round bolt hold-open, dimple for handguard timing, standard AR15 pin pattern |
| Status | Fully assembled; BCG and charging handle not included |
This upper is assembled and ready to install onto a compatible lower receiver, but you'll still need a bolt carrier group (BCG), charging handle, and a lower receiver. The muzzle device is not pinned or welded, so you may want to add a suppressor, brake, or flash hider if desired.
The EPC-9 upper is designed for 9mm and uses standard AR15 takedown and pivot pin lugs, so it will physically install on a milspec AR15 lower. However, because it fires 9mm instead of 5.56, you'll want a lower receiver specifically set up for 9mm ammunition and feeding—typically an AR9-specific lower with a compatible magazine well. Check with your lower's manufacturer to confirm compatibility.
Yes. The barrel is threaded 1/2"x28, which is the standard threading for 9mm suppressors. The threads are not pinned or welded, so you can attach a suppressor or other muzzle device directly. Always follow all applicable federal, state, and local laws regarding NFA items and suppressors in your area.
The ATLAS R-ONE is Aero Precision's lightweight, skeletonized handguard featuring a full-length Picatinny rail on top for mounting optics, lights, lasers, and other standard rail-mount accessories. It also includes quick-disconnect sling sockets at 3, 6, and 9 o'clock positions. The slim 1.3" inside diameter keeps the profile compact, and the ATLAS mounting system maintains strength and stability.
AeroPrecision
The Aero Precision EPC-9 9mm assembled upper receiver with 8.3" barrel and 7.3" handguard is a complete, ready-to-run upper built for 9mm AR pistol and rifle builds. This is a purpose-built upper for shooters wanting to run 9mm through a modern, reliable platform—whether you're setting up a short-barreled pistol, SBR, or plinking rifle. It comes fully assembled and threaded for a suppressor or muzzle device, so you're just a BCG and charging handle away from a functioning firearm.
The EPC-9 upper receiver is purpose-designed for 9x19 ammunition and features a last-round bolt hold-open mechanism that keeps the bolt locked back after the final round—a quality-of-life feature that makes unloading and chamber checking safer and faster. The receiver accepts most standard AR15 barrel nuts and handguards and includes Aero's proprietary ATLAS mounting system, which balances weight savings with solid attachment strength. Dimensioning and machining are dialed for proper handguard timing, and the upper uses standard AR15 takedown and pivot pin lugs for drop-in compatibility with most lower receivers.
The included ATLAS R-ONE handguard is a lightweight, skeletonized design that doesn't skimp on rail real estate. It runs a full-length Picatinny rail across the top for optics, lights, or other furniture, and includes quick-disconnect sling sockets at 3, 6, and 9 o'clock positions. The handguard has a 1.3" inside diameter and 1.5" outside diameter—slim enough to stay out of the way but rigid enough to handle whatever you mount. The 8.3" 9mm chrome-moly vanadium barrel is threaded 1/2"x28 (standard for 9mm suppressors) and finished with QPQ corrosion-resistant treatment inside and out.
Note: This upper does not include a bolt carrier group or charging handle, and the muzzle device is not pinned or welded, so you'll need to add those components separately. The barrel chamber is 9x19 Parabellum only.
| Brand | Aero Precision |
| Upper Receiver Type | EPC-9 (9mm-specific) |
| Barrel Length | 8.3" |
| Barrel Material | Chrome Moly Vanadium (CMV) |
| Barrel Finish | QPQ corrosion-resistant |
| Chamber | 9x19 Parabellum |
| Barrel Twist | 1 in 10 |
| Muzzle Threading | 1/2"x28 (standard 9mm) |
| Handguard | ATLAS R-ONE, 7.3" length |
| Handguard ID/OD | 1.3" ID / 1.5" OD |
| Top Rail | Full-length Picatinny |
| Sling Sockets | Quick-disconnect at 3, 6, and 9 o'clock |
| Receiver Material | 7075-T6 aluminum (forged) |
| Receiver Features | Last-round bolt hold-open, dimple for handguard timing, standard AR15 pin pattern |
| Status | Fully assembled; BCG and charging handle not included |
This upper is assembled and ready to install onto a compatible lower receiver, but you'll still need a bolt carrier group (BCG), charging handle, and a lower receiver. The muzzle device is not pinned or welded, so you may want to add a suppressor, brake, or flash hider if desired.
The EPC-9 upper is designed for 9mm and uses standard AR15 takedown and pivot pin lugs, so it will physically install on a milspec AR15 lower. However, because it fires 9mm instead of 5.56, you'll want a lower receiver specifically set up for 9mm ammunition and feeding—typically an AR9-specific lower with a compatible magazine well. Check with your lower's manufacturer to confirm compatibility.
Yes. The barrel is threaded 1/2"x28, which is the standard threading for 9mm suppressors. The threads are not pinned or welded, so you can attach a suppressor or other muzzle device directly. Always follow all applicable federal, state, and local laws regarding NFA items and suppressors in your area.
The ATLAS R-ONE is Aero Precision's lightweight, skeletonized handguard featuring a full-length Picatinny rail on top for mounting optics, lights, lasers, and other standard rail-mount accessories. It also includes quick-disconnect sling sockets at 3, 6, and 9 o'clock positions. The slim 1.3" inside diameter keeps the profile compact, and the ATLAS mounting system maintains strength and stability.
