Japanese Contract Steyr-Solothurn S1-100 (aka MP34)

Published on March 13, 2018
Duration: 13:13

This guide details the field stripping process for the Steyr-Solothurn S1-100 (MP34), a high-quality pre-WWII submachine gun. The video, presented by Ian McCollum of Forgotten Weapons, demonstrates how to access the bolt assembly and recoil spring for cleaning and maintenance. It highlights the robust construction and historical significance of this firearm, particularly its adoption by various international forces, including a specific Japanese contract variant.

Quick Summary

The Steyr-Solothurn S1-100, also known as the MP34, is a high-quality pre-WWII submachine gun designed by Louis Stange. Produced by Steyr-Solothurn Waffen AG to circumvent treaty restrictions, it was adopted internationally and is noted for its milled construction, controllable rate of fire (550-600 rpm), and unique features like a stripper clip guide.

Chapters

  1. 00:00Introduction to the Steyr-Solothurn S1-100
  2. 01:08Historical Context and Production
  3. 02:10Global Adoption and Calibers
  4. 03:31The Japanese Contract Model
  5. 04:10Design Features and Magazine
  6. 05:15Unique Stripper Clip Guide
  7. 06:09Fire Controls and Safety
  8. 07:08Disassembly and Internal Mechanism
  9. 08:25Bolt Details and Rate of Fire
  10. 10:01Markings and Accessories
  11. 11:38Provenance and Conclusion

Frequently Asked Questions

What is the Steyr-Solothurn S1-100 also known as?

The Steyr-Solothurn S1-100 is also widely known as the MP34. It was designed around 1930 by Louis Stange and is recognized as one of the finest submachine guns produced before World War II.

Why was the Steyr-Solothurn S1-100 produced by a joint venture?

Rheinmetall established Solothurn in Switzerland to bypass German arms manufacturing restrictions imposed by the Treaty of Versailles. Production was then handled by Steyr in Austria due to Solothurn's limited capacity, leading to the Steyr-Solothurn Waffen AG joint venture.

What calibers was the Steyr-Solothurn S1-100 available in?

The MP34 was offered in a variety of calibers, including 9x23mm Steyr, 7.63mm Mauser, 7.65mm Parabellum, .45 ACP, and 9mm Parabellum, catering to different military and police requirements.

What makes the Japanese contract MP34 significant?

This specific example is a Japanese contract model in 7.63mm Mauser, acquired by Japan in the late 1930s for their Special Naval Landing Forces. It's considered a veteran bring-back from WWII and is a fully transferable NFA firearm.

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