Aero Precision M5 12.5" Barreled .308 Upper Receiver with Atlas S-ONE Rail - Black

SKU: APAR538104M49
MPN: APAR538104M49
Manufactured by Aero Precision


In Stock

We are fully staffed and processing orders. Standard orders are shipping in approximately 1 business day. FFL orders take approximately 5 business days if you can provide us an actively receiving FFL location.


In Stock


NOTE: There are various specs for the AR-308 platform. For best fit and function, we recommend using this upper with Aero Precision’s M5 Gen2 .308 Stripped Lower Receiver (SKU: APAR308003).

NOTE: Does not include bolt carrier group or charging handle.

Known for their excellence in product manufacturing, Aero Precision’s 12.5" .308 WIN M5 Barreled Upper Receiver is a great start for an AR-308 pistol or registered SBR that's as compact as it is hard hitting. Equipped with a reliable carbine length gas system and lightweight ATLAS S-ONE free float M-LOK handguard, this is a high quality barreled upper you don't want to pass up.

  • 12.5" 41V50 steel barrel
  • Carbine length gas system
  • 5/8x24 thread pitch
  • 1:10 twist rate
  • DPMS-pattern barrel extension
  • Ships with A2 flash hider
  • 12" Atlas S-ONE M-LOK Handguard
  • Made in the U.S.A. in Tacoma, Washington


Barrel CoatingSalt Bath Nitride
Barrel ContourMedium
Barrel Length12.5
Barrel LiningSalt Bath Nitride
Barrel Material41V50 Chrome Moly Vanadium Steel
BrandAero Precision
Caliber Gauge.308 Win
Gas System LengthCarbine
Gas System TypeDirect Impingement
Muzzle DeviceA2 Flash Hider
Thread Pattern5/8 X 24
Twist Rate1:10

WARNING: This Product can expose you to chemicals which is known to state of California to cause Cancer and Reproductive Harm. For more information, see

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