Epc 9 Threaded Upper Receiver W/ Lrbho Fde

The Aero Precision EPC-9 Threaded Upper Receiver with LRBHO in FDE is purpose-built for AR9 pistol caliber carbine and rifle builds. If you're assembling a 9mm AR platform gun and want reliable last-round bolt hold-open functionality without reinventing the wheel, this upper receiver delivers straightforward, proven design. It's machined from 7075-T6 aluminum and engineered to work with standard AR15 barrel nuts, handguards, and takedown/pivot pin lugs—meaning you have real parts compatibility and don't need to hunt down exotic components.

The star feature here is the pre-installed last round bolt hold open (LRBHO) mechanism, which locks the bolt to the rear when you fire the last round from a Glock-pattern magazine. That's genuinely useful feedback during practice or when you need to conduct a reload. The dimple machined above the threads ensures proper handguard timing, and the laser-engraved T-marks on the receiver aid in alignment during assembly. FDE (Flat Dark Earth) finish blends modern aesthetics with proven corrosion resistance.

Aero Precision built this upper with the tinkerer and serious builder in mind—not the shooter who needs to be sold on features they'll never use. It's a solid, no-nonsense choice for PCC competition, range time, or a reliable 9mm truck gun.

Key Features

• Last round bolt hold-open (LRBHO) mechanism pre-installed and ready to function with Glock-pattern magazines
• Compatible with most standard AR15 barrel nuts and handguards for straightforward builds
• Dimple above threads for correct handguard timing and alignment
• Standard AR15 takedown and pivot pin lug pattern—drops into familiar builds
• Machined from 7075-T6 forged aluminum for durability and precision
• Laser-engraved T-marks for assembly reference
• FDE finish

Specifications

Frequently Asked Questions

What magazines does the LRBHO mechanism work with?

The last round bolt hold open is compatible with Glock-pattern magazines only.

Will this upper receiver work with my AR15 handguard and barrel nut?

Yes. The EPC-9 is designed to accept most standard AR15-compatible barrel nuts and handguards. It also features a dimple above the threads to ensure proper handguard timing.

What comes in the box?

You receive the upper receiver with the last round bolt hold open assembly already installed.

What pin pattern does this upper use?

The EPC-9 uses the standard AR15 takedown and pivot pin lug pattern, so it integrates with conventional lower receivers and build procedures.