The Aero Precision M5 Assembled Upper Receiver (brand part no. APAR308631AC) is a .308-pattern AR-10 upper receiver forged from 7075-T6 aluminum and finished in OD green, sold with both the port door and forward assist hardware already installed. Precision machined to accept standard .308 AR-10 pattern components, it is built as the perfect starting point for a big-bore build without needing to source and install those small parts separately. Aero Precision recommends pairing this upper with their own M5 .308 lower receiver for the most consistent, solid fit, though it is machined to standard M5 pattern dimensions. This is the stripped upper receiver only; barrel, bolt carrier group, and handguard are sold separately.

Key Specifications

• Forged from 7075-T6 aluminum for strength.
• Finished in OD green.
• Ships with the port door and forward assist hardware pre-installed.
• Machined to M5 .308/AR-10 pattern dimensions.
• Sold as a stripped upper receiver; barrel and BCG not included.

Frequently Asked Questions

Does this upper include a barrel or BCG? No, this is the stripped upper receiver only, with the port door and forward assist installed.

Does this need to be paired with an Aero M5 lower? Aero Precision recommends their M5 .308 lower for the most solid fit, though it follows standard M5 pattern dimensions.

Buy the Aero Precision M5 Assembled Upper Receiver

Start your big-bore build on a receiver with the small parts already handled. Order this Aero Precision upper from our AR-10 upper selection, and our Lubbock, Texas team will get it ready to ship as soon as it’s available.