16" Aero Precision M5E1 Enhanced .308 WIN AR Upper Receiver (16G308P-12E1KXX) - No BCG No Charging Handle

$ 501.97

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Aero Precision


This complete custom 16" .308 WIN upper receiver has been designed and purpose built from start to finish for accuracy. Each is hand built by order from the highest quality components available with 16 demanding quality inspections along the way that must be passed before shipment. Absolutely zero inspection failures are allowed. 

Starting with a 7075 T-6 billet aluminum M5E1 (.308) stripped upper receiver Aero Precision and our premium 16" .308 WIN Lightning Series barrel this well thought-out upper receiver features a matched Aero Precision super light-weight 12" Keymod free-float handguard and is fully lapped for accuracy. 

Just add your charging handle and bolt carrier group and you're ready go.


  • Aero Precision M5E1 Assembled Upper Receiver - Hard Coat Anodized Black
  • Aero Precision 12" Gen 2 Enhanced Keymod Handguard - Hard Coat Anodized Black
  • Ground Zero Precision Premium 16" Lightning Series .308 WIN Chambered Barrel - 4140 Gun Quality Steel, Heat Treated to RC 28-32 Hardness, and Stress Relieved
  • Ground Zero Precision Low Profile Steel Gas Block and Mid-Length Seamless Stainless Steel Gas Tube
  • Product comes assembled
  • This complete upper does not include a BCG or Charging Handle. 

M5E1 Upper Features:

  • Forged from 7075 T6 aluminum
  • Precision machined to our specs
  • M4 feedramps
  • High Temp Anodized - Black
  • .2795” takedown pin holes
  • Accepts all standard DPMS .308 components
  • Comes with forward assist and port door installed
  • Handguard mounting platform is forged into the receiver

NEW Gen 2 Enhanced Handguard Features:

  • Added quick disconnect sling socket at the 3, 6 and 9 o’clock positions
  • Milled additional surfaces along flats to aid with gripping and add visual appeal
  • New profile of the Picatinny Top Rail
  • 1pc free float design
  • Rail is Machined from 6061-T6 Aluminum
  • Hard Coat Anodized - Black
  • Built in Anti-Rotation tabs
  • Scalloped rails
  • Continuous top rail
  • 1.72" inside diameter fits most muzzle devices and 1.5" suppressors
  • Compatible with low profile gas blocks
  • Compatible with all properly spec'd Keymod rail sections & accessories.

Ground Zero Precision 16" Lightning Series .308 WIN Barrel Features:

  • Twist: 1 in 10
  • Threading: 5/8 x 24
  • Material: 4140 Gun Quality Steel, Heat Treated to RC 28-32 Hardness, and Stress Relieved
  • Finish: Parkerized
  • Gas Block Journal: .750
  • Gas System Length: Mid-Length
  • Weight: 36.9 oz
  • DPMS Barrel Extension
  • HP and MPI Tested