MDP-9 Upper GEN2 AAUMDP0906
roller delayed ar9 upper receiver
MDP-9 Upper GEN2 AAUMDP0906
AR9 1913 Endrail
Angstadt Arms MDP-9 in small bag
Single Point Sling MDP-9 Pistol
Shooting MDP-9 SBR with Gia
MDP-9 Short Barrel Rifle with Folding Stock
MDP-9 Pistol with Rugged Obsidian Suppressor
1913 Picatinny Endrail

MDP-9® GEN2 Roller Delayed Upper

Complete MDP-9 GEN2 9mm roller delayed upper receiver assembly. Compatible with AR9 and AR15 lower receivers. Includes 1913 Endrail adaptor.


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SKU: AAUMDP0906Categories: , , , ,

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The MDP-9 GEN2 roller delayed action is now available as a stand alone upper receiver assembly. This is a direct upgrade for existing Angstadt Arms UDP-9 firearms and 3rd party AR9 lower receivers.

Experience unmatched portability without compromising performance

  • Light and Agile: With a length of just 14” and weighing 3.7lbs, the MDP-9 promises easy concealment
  • Smooth Performance: Leveraging the roller delayed system, expect significantly less recoil, ensuring precision even in high-pressure scenarios
  • Modern Design: Drawing elements from the AR-15/M4 platform, the MDP-9 is both familiar and revolutionary

In a world filled with unforeseen threats, traditional firearms lack the combination of power and compactness needed for immediate response.

The MDP-9 is designed to be light, small, yet fully functional, offering a revolutionary roller delay action that reduces recoil. Gain the peace of mind and confidence you need for protection in any situation, with the perfect balance of size and strength.

MDP-9 GEN2 Roller Delayed Upper Specifications:

  • ACTION: Roller-delayed blowback
  • CALIBER: 9x19mm
  • FINISH: Black Type III Hard Coat Anodized
  • UPPER ASSEMBLY: 7075-T6 aluminum monolithic upper receiver assembly with continuous top picatinny rail, M-LOK interface and QD sling points
  • CHARGING HANDLE: Non-reciprocating ambidextrous forward charging handle (can be swapped from left to right side)
  • BARREL: 5.85″ chrome moly black melonite barrel with a 1/10 twist and threaded 1/2×28 TPI
  • MUZZLE DEVICE: Removable 3-lug muzzle device
  • ENDRAIL INTERFACE: Includes 1913 endrail with QD sling socket. Endrail will accept most 1913 side-folding & telescoping pistol brace and stock options
  • FURNITURE: Angstadt Arms handstop
  • LRBHO: The Last round bolt hold open functionality is determined via your lower receiver
  • FIRE CONTROL COMPATIBILITY: The MDP-9® roller delayed upper is compatible with many 9mm PCC triggers. Please see this page for trigger compatibility. We recommend the EMT-9 PCC Trigger
  • WEIGHT: 2.58 lbs
  • COUNTRY OF MANUFACTURE: Made in Charlotte, NC USA!
  • Patented

Lower Receiver Compatibility:
The MDP-9 upper is designed to work with a wide range of AR9 GLOCK magazine lower receivers, as well as mil-spec AR-15 receivers.

For the best possible function we strongly recommend our AR9 lower receiver however, we have successfully tested the MDP-9 upper with these 3rd party receivers. Please note due to 3rd party manufacturing tolerances we can’t ensure 100% reliability in every third party configuration.

  • Angstadt Arms 0940 9mm Receiver
  • Angstadt Arms UDP-9
  • Aero Precision EPC-9
  • Quarter Circle 10 QC10 Ranger (GSF)
  • Palmetto State Armory PSA PX-9
  • Foxtrot Mike Mike-9
  • New Frontier Armory C-9
  • CMMG Banshee MkG
  • CMMG Banshee Mk17 (Sig Sauer P320/M17/M18 pattern magazines)
  • Lone Wolf Distributors Glock magazine lower receiver
  • Mil-Spec AR-15 lower receiver with Mean Arms EndoMag. “Ejectorless” CMMG version only

The MDP-9 roller-delayed action incorporates a spring-loaded ejector within the upper receiver. For proper function you will need to remove the ejector in your lower receiver. Typically, this is secured in position with a roll pin or set screw. Please note the MDP-9 upper is not compatible with Colt, MP5, or CZ Scorpion magazine lower receivers.

Trigger Compatibility:

Please see this page for trigger compatibility. We recommend the EMT-9 PCC Trigger

Weight3 lbs
Dimensions14 × 3 × 3 in

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MDP-9 Upper GEN2 AAUMDP0906
MDP-9® GEN2 Roller Delayed Upper

Out of stock