MPi-81: Steyr Basically Makes the Uzi

Published on June 17, 2022
Duration: 11:50

This guide details the disassembly of the Steyr MPi-81 submachine gun, focusing on its unique internal mechanics. Expert instruction covers removing the bolt and recoil assembly, highlighting the telescoping bolt design and dual sear safety system. This information is crucial for understanding the firearm's operation and maintenance.

Quick Summary

The Steyr MPi-81, inspired by the Uzi, features a compact design with a telescoping bolt for a longer barrel within a shorter receiver. Notable features include a non-reciprocating charging handle, a heel-mounted magazine release, and a dual sear safety system. It fires 9mm Parabellum ammunition and utilizes proprietary 25 or 32-round magazines.

Chapters

  1. 00:00Introduction and History
  2. 01:25Basic Features and Magazines
  3. 02:05Sights and Adjustments
  4. 02:48Fire Controls
  5. 04:02Stock and Charging Handle
  6. 05:40Disassembly and Internal Mechanics
  7. 07:49Safety Mechanisms
  8. 09:43Markings and Conclusion

Frequently Asked Questions

What is the primary design inspiration for the Steyr MPi-81?

The Steyr MPi-81 was essentially a copy of the Uzi submachine gun design, developed by Steyr in the late 1960s to meet the Austrian government's requirement for a new submachine gun, evolving from the earlier MPi-69 model.

How does the Steyr MPi-81's telescoping bolt benefit its design?

The MPi-81 features a telescoping bolt, which wraps around the barrel. This design allows for a longer barrel length (approximately 10 inches) to be housed within a more compact receiver by moving the bolt's mass forward.

What are the key differences between the Steyr MPi-81 and the Uzi?

While sharing a similar concept, the MPi-81 features a non-reciprocating charging handle on the top-left and a heel-mounted magazine release, contrasting with the Uzi's traditional charging handle and push-button release.

What safety features are notable on the Steyr MPi-81?

The MPi-81 incorporates a dual sear engagement system that acts as a drop safety. It also has a cross-bolt safety/selector button with positions for Safe, Semi-auto, and Full-auto.

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