The Aero Precision Assembled XL Upper Receiver (brand part no. APAR611310AC) is forged from 7075-T6 aluminum and built specifically for AR-15 builders planning to send bigger rounds down range. The XL Upper’s enlarged ejection port opening handles larger-diameter brass reliably, which matters for cartridges that a standard AR-15 ejection port wasn’t sized around. It carries the laser-marked XL designation on the upper receiver tang along with laser-engraved T-markings, uses standard .250-inch takedown pin holes, and is compatible with AR-15 lower receivers, port doors, and forward assists, working with standard AR-15/M16 components throughout. This assembled version ships with the port door and forward assist already installed. As an upper receiver, it is not itself a complete firearm; builders still need to add a charging handle, barrel, handguard, gas block, muzzle device, gas tube, and bolt carrier group to complete the upper, along with a compatible lower receiver.

Key Specifications

• Forged from 7075-T6 aluminum.
• Features an enlarged ejection port for larger-diameter brass.
• Laser-marked XL designation on the upper receiver tang.
• Uses standard .250-inch takedown pin holes.
• Ships with the port door and forward assist installed.
• Finished in black anodizing.
• Compatible with standard AR-15/M16 components.

Frequently Asked Questions

Does this upper include a barrel or BCG? No, builders need to add a charging handle, barrel, handguard, gas block, muzzle device, gas tube, and bolt carrier group to complete the upper.

Why would I need an enlarged ejection port? A larger ejection port opening is built to reliably handle bigger-diameter brass than a standard AR-15 ejection port.

Is a lower receiver required to build a complete rifle? Yes, this is an upper receiver only and requires a compatible AR-15 lower receiver to complete a functioning firearm.

Buy the Aero Precision Assembled XL Upper Receiver

Order it from our Lubbock, Texas gun shop as soon as it’s available to ship, and start your big-bore AR-15 build on a purpose-built foundation.

Shop more from Aero Precision and browse our full AR15 uppers selection.