MDP-9® Roller Delayed Upper

COMPACT POWER: ANYTIME READY
New for Fall 2023 – 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.

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 Roller Delayed Upper Specifications:

• 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
• OVERALL LENGTH WHEN INSTALLED: 14″
• 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 that utilize a mag block. 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 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 EndoMag. “Ejectorless” CMMG version only
• Mil-Spec AR-15 lower receiver with a Glock magazine adaptor

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.