16" Aero Precision M5E1 Enhanced FDE .308 WIN AR Upper Receiver (16G308P-15E1KFP)

$ 705.00

Sold Out

Aero PrecisionThis 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 cerakoted in Magpul flat dark earth (H-267Q) from Aero Precision and our premium 16" .308 WIN Lightning Series barrel this well thought-out upper receiver features a matched Magpul flat dark earth Aero Precision super light-weight 15" Keymod free-float handguard and is fully lapped for accuracy. 


  • Aero Precision M5E1 Assembled Upper Receiver - Cerakoted Magpul Flat Dark Earth (H-267Q)
  • Aero Precision 15" Gen 2 Enhanced Keymod Handguard - Cerakoted Magpul Flat Dark Earth (H-267Q)
  • 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

M5E1 Upper Features:

  • Forged from 7075 T6 aluminum
  • Precision machined to our specs
  • M4 feedramps
  • High Temp Cerakote Finish - Magpul Flat Dark Earth (H-267Q)
  • .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
  • High Temp Cerakote Finish - Magpul Flat Dark Earth (H-267Q)
  • 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

Aero Precision .308 / 7.62 Phosphated Bolt Carrier Group (OPTION 1)

Aero Precision's Phosphated .308 / 7.62 Bolt Carrier Group is the perfect firing mechanism for your big-bore rifle build. This high quality BCG features a mil-spec phosphate finish, is MPI/HPT and now includes a laser engraved Aero Precision "A" logo!

Option 1 Carrier Features:

  • Material: Billet carrier machined from 8620 steel and case hardened
  • Finish: Mil-spec Phosphate coating
  • Gas Key: 4130 Steel attached with Grade 8 hardware and properly staked
  • Firing Pin: Machined from 8740 steel and hard chrome coated
  • Forward Assist serrations
  • Laser engraved Aero Precision logo
  • Carrier fits DPMS compatible style AR Rifles

Option 1 Bolt Features:

  • Material: Case Hardened 9310 Steel
  • Finish: All bolt components are shot peened and phosphate coated
  • Extractor: Machined from 4340 Steel with double o-rings and double springs
  • Magnetic Particle Inspected and High Pressure Tested
  • High pressure bolt - external surfaces are CNC ground after heat treat for a precision fit and firing pin hole diameter is reduced to .070"
  • Multi-caliber bolt designed to function with .308, 7.62x51, 6.5 Creedmoor, .338 Federal and other .308 based cartridges.

Option 1 BCG Includes:

  • Bolt carrier
  • Complete bolt
  • Firing pin
  • Cam pin
  • Retaining pin

Dead Bolt High Pressure .308 / 7.62 / MULTI-CAL Nickel Boron & QPQ Nitride Bolt Carrier Group (OPTION 2)

High Pressure BCG 6.5 Creedmoor

Ground Zero Precision's upgraded .308/7.62/MULTI FAIL ZERO Nickel Boron Coated & QPQ Nitrided Bolt Carrier Group is an amazingly durable, eye catching addition to your AR build. Mil- spec dimensions and coating ensure the highest quality and correct component interface.

Option 2 Carrier and Bolt Features:

  • Carrier is precision machined from 8620 steel
  • Carrier, Key & Cam Pin Features Nickel Boron coating by Fail Zero
  • High Pressure Bolt is machined from 9310 steel - QPQ Nitride Finish - Black
  • Magnetic Partical Inspected
  • High Pressure Tested
  • Includes custom crafted 17-4 firing pin - QPQ Nitride Finish - Black
  • Forward Assist serrations
  • Weight: 17.92oz

    Option 2 BCG Includes:

    • Bolt carrier
    • Complete bolt
    • Firing pin
    • Cam pin
    • Retaining pin