Leaders in Machine Pistols: the Beistigui Hermanos MM31

Published on January 4, 2026
Duration: 1:12

This expert-level review delves into the Beistigui Hermanos MM31, a selective-fire pistol that builds upon the Mauser C96 design. The video highlights its unique selector mechanism and compares its internal mechanics to the original Mauser, noting objective improvements despite questionable marketing practices by the manufacturer. The instructor's deep knowledge of firearm history and mechanics is evident.

Quick Summary

The Beistigui Hermanos MM31 is a selective-fire pistol from Spain, recognized as the first to offer full-auto capability based on the Mauser C96 design. It features an accessible thumb selector for 'R' (rapid/full auto) and 'N' (normal/semi-auto) modes, and a mechanically improved single-piece locking block pinned to the upper receiver.

Chapters

  1. 00:00Introduction to MM31
  2. 00:26Firearm Controls
  3. 00:37Comparison with Mauser C96
  4. 00:57Design Improvements and Marketing

Frequently Asked Questions

What is the Beistigui Hermanos MM31?

The Beistigui Hermanos MM31, or Modello Militar 31, is a selective-fire pistol manufactured in Spain. It is notable for being the first selective-fire version of the Mauser C96 pistol, featuring a distinct locking block design.

How does the MM31's fire selector work?

The MM31 is equipped with a selector switch located on the left side of the firearm. This allows the user to easily switch between 'R' for rapid (full-auto) fire and 'N' for normal (semi-auto) fire, with the selector conveniently positioned for thumb operation.

What are the key mechanical differences between the MM31 and the Mauser C96?

While operating on a similar principle, the MM31 has several distinct parts compared to the Mauser C96. A significant difference is its locking block, which is pinned to the upper receiver as a single, integrated piece, suggesting an objective mechanical improvement.

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