Aero Precision M4E1 Threaded AR-15 Barreled Upper Receiver .300 BLK Pistol Length – ATLAS S-ONE – 16″


  • M4E1 threaded upper receiver
  • Forged 7075-T6 aluminum
  • Assembled forward assist and dust cover
  • 15” ATLAS S-ONE M-LOK handguard
  • Hardcoat anodized
  • 16” .300 Blackout barrel
  • Machined from Chrome Moly Vanadium
  • Pistol length gas system
  • 1:7 twist rate
  • Threaded 5/8×24
  • A2 flash hider
  • Salt Bath Nitride finished
  • Does not include BCG or charging handle


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SKUAPAR700305M14 Category

This complete upper receiver assembly comes with everything you need to get started, including a 16” .300 Blackout barrel and a pistol length gas system. The forged 7075-T6 aluminum upper receiver is extremely durable and looks great when paired with the M4E1 lower receiver. The ATLAS S-ONE free float handguard is made from the same high quality materials and features M-LOK slots for adding your favorite accessories. This .300 BLK AR-15 barreled upper receiver assembly does not include a BCG or charging handle but does include the forward assist and dust cover.


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