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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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Aero Precision is a key manufacturer for many AR15/10 OEM suppliers and their history in the aerospace industry provides attention to detail in their products. Their precision parts will help you build a solid platform and achieve repeatable results. Aero Precision produces upper receivers, lower receivers, handguards, scope mounts, and various other pieces in house. All of Aero Precision's products are Made In America and they will continue to provide you with components of the highest quality.

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