Aero Precision M5 Complete Upper Receiver - .308 Winchester, 16" Barrel, Black The Aero Precision M5 Complete Upper Receiver is a fully assembled, precision-built AR-308 upper ready to take your build to the next level. Chambered in .308 Winchester, this upper features a 16-inch 4150 Chrome-Moly Vanadium steel barrel with a QPQ finish and a 1:10 twist rate for outstanding accuracy and durability. The M5 upper receiver is machined from 7075 T6 aluminum and incorporates an ejection port door and forward assist right out of the box. A full-length Picatinny top rail blends seamlessly with the ATLAS S-ONE handguard, providing a clean and uninterrupted sighting plane. The proprietary ATLAS attachment system delivers a slim yet rock-solid mounting platform while keeping weight to a minimum. Please note: this complete upper does NOT include a bolt carrier group (BCG) or charging handle. Product Highlights Premium Barrel Construction: 16-inch 4150 Chrome-Moly Vanadium steel barrel with QPQ finish and 1:10 twist rate for reliable .308 Winchester performance. ATLAS S-ONE Handguard: Lightweight, slim-profile handguard featuring the proprietary ATLAS attachment system for strength, stability, and easy accessory mounting via M-LOK slots. M5 7075 T6 Aluminum Upper Receiver: Precision-machined for a tight fit with laser-engraved T-Marks, ejection port door, and forward assist installed. Full-Length Picatinny Top Rail: Provides an uninterrupted optics and accessory mounting surface along the full top of the receiver and handguard. Fully Assembled and Ready to Build: Ships pre-assembled with a low profile gas block and mid-length gas tube; simply add a BCG, charging handle, and lower receiver to complete your rifle. Specs Brand: Aero Precision MPN: APAR538705M22 UPC: 840014609611 Caliber: .308 Winchester Barrel Length: 16 inches Barrel Material: 4150 Chrome-Moly Vanadium Steel Barrel Finish: QPQ Twist Rate: 1:10 Muzzle Device: A2 Flash Hider (5/8x24 TPI) Barrel Extension: DPMS Gas System: Mid-Length Gas Block: Low Profile Upper Receiver Material: M5 7075 T6 Aluminum Takedown Pins: .2795" Tang: DPMS High Profile (.210) Handguard: ATLAS S-ONE Top Rail: Full-Length Picatinny Color/Finish: Black, Anodized Included Features: Ejection Port Door, Forward Assist, Laser Engraved T-Marks BCG/Charging Handle Included: No Compatibility: Aero Precision M5 (.308 Win) Style Lower Receivers and other .308 AR pattern lower receivers with .2795" takedown pins Disclaimer: We strive to provide accurate and up-to-date product descriptions, specifications, and images; however, errors or omissions may occasionally occur. We are not responsible for any inaccuracies or discrepancies in the content provided. If you notice anything incorrect or unclear, please contact us so we can correct it. When in doubt, we recommend verifying details directly with the product&';s manufacturer. ]]>