American MP5 based on AR15 - Angstadt Arms MDP9

Published on June 22, 2022
Duration: 18:55

This video provides a detailed review and operational breakdown of the Angstadt Arms MDP9, a roller-delayed firearm based on the AR-15 platform. It covers external features, internal operation, disassembly, reassembly, and comparisons to HK MP5 and Stribog systems. The MDP9 utilizes Glock magazines and offers a soft-shooting experience, though at a premium price point.

Quick Summary

The Angstadt Arms MDP9 is a 9mm pistol caliber carbine utilizing a roller-delayed blowback operating system, similar to the HK MP5 but built on an AR-15 platform. It accepts standard Glock magazines and features a non-reciprocating charging handle, offering a softer shooting experience.

Chapters

  1. 00:10Introduction to Angstadt Arms MDP9
  2. 00:37First Shots and Zeroing
  3. 01:45MDP9 Features and Operation
  4. 02:07External Features Breakdown
  5. 03:27Muzzle Device and Threads
  6. 04:21Disassembly Process
  7. 04:54Roller Delay vs. Roller Lock Explained
  8. 06:25Upper Receiver Internals
  9. 07:37Bolt Carrier and HK-like Assembly
  10. 08:07Bolt Head Disassembly
  11. 08:45MDP9 Disassembled
  12. 09:02Function Tests: Glock Mags, Hip Fire, Bump Fire
  13. 09:26HK MP5 Bolt Comparison
  14. 11:32Stribog Roller Delay System
  15. 12:01System Comparison: HK, MDP9, Stribog
  16. 15:10MDP9 Reassembly Guide
  17. 16:26Reassembled MDP9
  18. 16:41Overall Thoughts and Price
  19. 17:13Fit and Finish Observations
  20. 17:39Price Point and Value
  21. 18:09Support the Channel

Frequently Asked Questions

What makes the Angstadt Arms MDP9 a roller-delayed firearm?

The Angstadt Arms MDP9 uses a roller-delayed blowback operating system. This system employs rollers that are pushed outward into recesses in the barrel extension, delaying the bolt's rearward movement until sufficient pressure has dissipated, allowing for a softer recoil impulse.

Does the Angstadt Arms MDP9 use standard AR-15 parts?

The MDP9 incorporates an AR-15 style lower receiver and fire control unit, meaning standard AR-15 triggers can be used. However, its upper receiver and bolt carrier group are proprietary designs adapted for the roller-delayed blowback system.

What type of magazines does the Angstadt Arms MDP9 accept?

A key feature of the Angstadt Arms MDP9 is its compatibility with standard Glock magazines. This provides users with access to a wide variety of readily available and reliable magazine options for the firearm.

How does the MDP9's roller-delayed system differ from a roller-locked system?

In a roller-delayed system like the MDP9, the barrel remains stationary. The bolt head unlocks and moves rearward after pressure has reduced. In contrast, a roller-locked system, like the MG42, locks the bolt head into the barrel extension until the entire barrel and receiver move rearward, allowing for unlocking.

What are the main differences between the MDP9 and the HK MP5 bolt systems?

While both use a similar roller-delayed principle, the MDP9's bolt head and carrier are dimensionally smaller and lighter than those of the HK MP5. This results in less reciprocating mass, potentially contributing to less perceived recoil in the MDP9.

More Reviews Videos You Might Like

More from Military Arms Channel

View all →