Aero Precision M4E1 Complete AR-15 Upper Receiver 16" 5.56 NATO 15" ATLAS S-ONE Black

• AR-15 Complete Upper Receiver
• Caliber: 5.56 NATO (also accepts .223 Remington)
• 16" 4150 Chrome-Moly Vanadium Steel Barrel, QPQ Finish
• 1:7 Twist Rate
• A2 Flash Hider
• Low Profile Gas Block
• Mid-Length Gas System
• M4E1 Threaded Upper Receiver
• M4 Feed Ramps
• Laser Engraved T-Marks
• 15" ATLAS S-ONE M-LOK Handguard
• QD Sling Sockets at 3, 6, & 9 o'clock Positions
• Anodized Black Finish

Fits:

• Mil-Spec AR-15 Lower Receivers