MDP-9 RESOURCES
Helpful how to articles, videos and frequently asked questions about the roller delayed Angstadt Arms MDP-9
overview
MDP-9 in-depth
Everything you need to know about enjoying your MDP-9. We recommend you start here
How to video
MDP-9 cleaning instructions
How to properly clean and field strip your MDP-9
Download
Instruction manuals
Instruction manuals for the MDP-9 pistol, SBR and roller delayed AR9 upper receiver
MDP-9 KNOWLEDGE BASE
Frequently Asked Questions
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
Please note the MDP-9 upper is not compatible with Colt, MP5, or CZ Scorpion magazine lower receivers
Converting your lower receiver
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.
Upgrading your UDP-9
Follow the instructions in this manual to convert your UDP-9 lower receiver to accept the MDP-9 roller delayed upper
Trigger Compatibility
Please see this page for trigger compatibility. We recommend the EMT-9 PCC Trigger