Epc 9 Threaded Upper Receiver W/Lrbho Odg

The Aero Precision EPC-9 threaded upper receiver is purpose-built for AR9 pistol caliber builds that demand reliability and smart engineering. This OD green anodized upper ships with a last round bolt hold open mechanism pre-installed, so you get functional feedback when your magazine runs dry—handy on the range and in practical shooting. It's forged from 7075-T6 aluminum and finished with laser-engraved T-marks for clean aesthetics and ease of alignment.

The threaded design accepts standard AR15-compatible barrel nuts and handguards, making parts sourcing straightforward for most builders. A dimple machined above the threads ensures proper handguard timing, and the upper maintains the standard AR15 takedown and pivot pin lug pattern you're already familiar with. Whether you're assembling your first pistol caliber AR or rounding out a collection, this upper receiver handles the job without fuss.

One important note: the last round bolt hold open mechanism is compatible with GLOCK-pattern magazines, so confirm your magazine choice before finalizing your build. If you're pairing this with a dedicated EPC-9 lower and Glock-compatible magazines, you'll have a modern, controllable shooter that's equally at home in 3-gun or as a home-defense workhorse.

Key Features

• Last round bolt hold open (LRBHO) mechanism pre-installed
• Accepts standard AR15 barrel nuts and handguards
• Dimple for precise handguard timing
• 7075-T6 aluminum construction with OD green anodizing
• Standard AR15 takedown and pivot pin lugs
• Laser-engraved T-marks for alignment reference

Specifications

Frequently Asked Questions

What magazines work with the last round bolt hold open?

The LRBHO mechanism is compatible with GLOCK-pattern magazines. If you're using a different magazine platform, the bolt hold open will not function, though the upper will still cycle and operate normally.

Will this upper work with any AR15 handguard?

Most standard AR15-compatible barrel nuts and handguards will fit. The dimple machined above the threads helps ensure proper timing, but handguard fit ultimately depends on your barrel nut choice and handguard design.

Is the LRBHO assembly pre-installed?

Yes, the last round bolt hold open assembly arrives pre-installed in the upper receiver. You're ready to pair it with a lower and start your build.

What caliber is this upper for?

The EPC-9 is designed for 9mm pistol caliber AR builds. Pair it with an appropriate EPC-9 lower receiver and 9mm barrel to complete your build.