Aero Precision APAR620201AC EPC-9 Threaded Receiver 9mm Luger 7075-T6 Black Anodized Aluminum for AR-Platform

The Aero Precision EPC-9 upper receiver is built for shooters ready to dial in a reliable 9mm Luger AR-platform pistol caliber carbine. This threaded upper delivers the precision and durability Aero is known for, machined from 7075-T6 aluminum and finished in hard-coat black anodize. It's a purpose-built receiver that takes the guesswork out of your PCC (pistol caliber carbine) build and works with the magazines and platform you likely already have.

What sets the EPC-9 apart is its last round bolt hold open (LRHBO) mechanism—a feature that makes running high-round-count drills or competitive matches more intuitive. When you burn through a magazine, the bolt locks back, just like you'd expect from a centerfire gun. That responsiveness makes a real difference in how the gun handles, whether you're training, running matches, or simply enjoying the range.

The receiver accepts standard AR15 barrel nuts and handguards, so you're not locked into a proprietary ecosystem. A dimple above the threads ensures proper handguard timing, and the standard AR15 takedown and pivot pin lug pattern means no learning curve if you've built an AR before. The threaded design gives you flexibility for suppressor-ready configurations or other muzzle devices. Laser-engraved T-marks help with component alignment during assembly.

This is an upper receiver only—plan your build around quality barrels, bolt carrier groups, and triggers to complete the platform. Aero's attention to forging and finish means your EPC-9 will track straight and handle thousands of rounds without premature wear.

Key Features

• Last round bolt hold open (LRHBO) mechanism for intuitive manual-of-arms
• Threaded design ready for suppressors or muzzle devices
• Compatible with standard AR15 barrel nuts and handguards
• Dimple above threads for proper handguard timing
• Standard AR15 takedown and pivot pin lugs—no proprietary fitment
• Machined from custom-forged 7075-T6 aluminum for strength and durability
• Hard-coat black anodized finish
• Laser-engraved T-marks for assembly reference

Specifications

Frequently Asked Questions

What magazines work with the EPC-9 last round bolt hold open?

The LRHBO mechanism is compatible with Glock pattern magazines. Make sure your magazine selection matches this requirement if you want the bolt-hold-open function to operate properly.

Can I use this upper with a standard AR15 handguard?

Yes. The EPC-9 accepts standard AR15 barrel nuts and handguards. A dimple above the threads aids in proper handguard timing during assembly.

Does this upper come complete, or do I need to add parts?

The upper receiver comes with the LRHBO assembly pre-installed. You'll need to source a bolt carrier group, barrel, charging handle, and other internal components to complete the build.

Is the EPC-9 receiver threaded for suppressors?

Yes, the EPC-9 features a threaded design, making it ready for a suppressor or other compatible muzzle device.