Maxim Defense PDX 5.56 Complete Upper - Black - 5.5"

SKU: MXM-47813
MPN: MXM-47813
Manufactured by Maxim Defense


Out of Stock

NOTE: Limit 1 per household. Quantities exceeding 1 will not allow checkout.


Out of Stock


NOTE: This upper assembly has a barrel less than 16” in length. These uppers are intended for use in AR-15 pistols or legal short-barreled rifles. Other configurations may violate Federal law.

The Maxim Defense PDX Complete Upper Receiver is chambered in 5.56 and is compatible with standard AR style lower receivers. The PDX 5.56 features a 5.5” barrel while still being a traditional AR style gas system and retaining all the reliability. The Maxim Hatebrake muzzle brake directs gas and concussion down range away from the shooter and decreases the flash signature making it more bearable for the user when used in close quarters. If you are looking to change up your collection, check out the Maxim Defense 5.56 PDX AR-15 Complete Upper.

  • 5.5” barrel chambered in 5.56x45
  • Maxim Hatebrake muzzle brake
  • Black anodized
  • M-LOK free float handguard with hand stop
  • Billet machined receiver
  • Ambidextrous charging handle
  • Standard BCG
  • Compatible with Mil-Spec lowers

The upper receiver is machined from billet aluminum and hardcoat anodized black and the free float handguard features M-LOK attachment slots and QD sling swivel slots as well as a hand stop. This complete upper receiver includes a bolt carrier group and ambidextrous charging handle.


Barrel Length5.5
BrandMaxim Defense
Caliber Gauge5.56 NATO
Gas System LengthPistol
Gas System TypeDirect Impingement
Muzzle DeviceMaxim Defense Hatebrake

Ratings & Reviews

No reviews available

Be the first to Write a Review