The Aero Precision M5 Complete Upper (brand part number APAR538705M22) pairs a 16-inch .308 Winchester chrome barrel with the company’s ATLAS R-ONE M-LOK handguard on a forged M5 assembled upper receiver. Built by Aero Precision, the barrel runs a 1:10 twist rate suited to standard .308 bullet weights and a rifle-length gas system with a low-profile gas block and tube. The 7075-T6 forged receiver includes M4 feedramps, laser-engraved T-marks, and an assembled port door and forward assist, giving AR-10 pattern builders a complete, ready-to-finish upper.

Key Specifications

• Barrel length is 16 inches, chambered in .308 Winchester/7.62 NATO.
• Twist rate is 1:10, matched to standard .308 bullet weights.
• Barrel material is chrome moly with a matte black finish.
• Handguard is the ATLAS R-ONE M-LOK free-float design.
• Upper receiver is forged 7075-T6 aluminum, the M5 platform pattern.
• Runs a rifle-length gas system with a low-profile gas block and tube.
• Includes M4 feedramps and laser-engraved T-marks.
• Ships with the port door and forward assist assembled.
• Product ships fully assembled, ready to add a BCG and lower.

Frequently Asked Questions

Does this fit a standard AR-10 lower? Yes, it is built to the M5 pattern used across compatible AR-10 style lowers.

Is a bolt carrier group included? This listing covers the complete upper assembly; confirm current BCG inclusion before ordering if you need one.

Buy the Aero Precision M5 16-inch .308 Complete Upper

Finish your AR-10 build with a full-length .308 upper ready for a BCG and lower. Order this AR-10 upper from our Lubbock, Texas gun shop, and we will get it to your door as soon as it’s ready to ship.