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APAR620201AC Aero Precision EPC-9 9/40 Threaded Assembled Upper Receiver w/ LRBHO - Anodized Black

Manufacturer: Aero Precision
Manufacturer part number: APAR620201AC
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The Aero Precision EPC-9 9/40 Threaded Assembled Upper Receiver with LRBHO (APAR620201AC) is the perfect addition to any AR9 build. Including a last round bolt hold-open mechanism and compatible with most standard AR15 barrel nut and handguard combinations this upper receiver will help take your pistol caliber build to the next level.


  • Last round bolt hold open mechanism
  • Accepts most AR15 compatible barrel nuts and handguards
  • Dimple above threads to allow for proper handguard timing
  • Standard AR15 takedown/pivot pin lug pattern
  • Machined from custom forged 7075-T6 aluminum
  • Laser engraved T-marks
  • Weight: 7 oz


  • Upper Receiver
  • Pre-installed last round bolt hold open assembly

Note: The EPC last round bolt hold open is ONLY compatible with appropriate GLOCKĀ® pattern magazines.

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