Angstadt Arms has announced the roll out of the MDP-9 roller delayed upper receiver chambered in 9mm.

Angstadt Arms states “The MDP-9 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.

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.”


  • ACTION: Roller-delayed blowback
  • CALIBER: 9mm
  • 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
  • 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

To learn more about Angstadt Arms. CLICK HERE