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*WASHINGTON STATE RESIDENTS ONLY* LAST CALL - All MAGAZINES and IN-STORE firearms orders with Magazines over 10 rounds must be place by 11:59pm PST, June 28th, 2022

Maxim Defense MDX 510 7.62x39 Mil-Spec Complete Upper - 10.3" Urban Grey

AR-10 Complete Upper Receiver

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Maxim Defense MDX 510 7.62x39 Mil-Spec Complete Upper - 10.3" Urban Grey


The MDX510 upper receiver is compatible with your existing Mil-Spec lower and is packed with Maxim Defense quality. It comes with either their Mil-Spec bolt carrier group or SCW bolt carrier group for those using their SCW system. For those wanting a standard length short barrel, the 10.3” barrel of the MDX510 is your best choice. Like their other uppers, the MDX510 includes their HATEBRAKE for increased reliability, Radian Raptor charging handle, and Maxim Defense hand stop.



  1. Increased reliability due to included HATEBRAKE
  2. Armorer level adjustable gas block
  3. M-slot compatible handguard
  4. Military-grade materials [17-4 Stainless Steel, 7075 and 6061 Aluminum]
  5. HK height rail for a more rigid upper receiver
  6. Installs on any Mil-Spec lower receiver
  7. Comes with Mil-Spec BCG
  8. Includes one 30rd C Products Magazine



  • Weight: 4 lbs 2 oz
  • Barrel length: 10.3”
  • Calibers: 7.62x39mm
  • Thread Pitch: 5/8x24
More Information
SKU MXM-48126
Product Type AR-10 Complete Upper Receiver
Manufacturer Maxim Defense
Thread Pitch 5/8x24
Color Urban Grey
Barrel Length 10.3"
Caliber 7.62x39
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