Suomi Compensator Comparison - Does It Work?

Published on February 19, 2022
Duration: 4:45

This guide details a comparison test of the Suomi KP/-31 submachine gun with and without its slotted compensator. The test, conducted by Ian McCollum of Forgotten Weapons, aims to quantify the compensator's impact on muzzle climb and controllability during automatic fire. The results indicate a significant improvement in handling with the compensator installed.

Quick Summary

Live-fire tests by Forgotten Weapons demonstrate that the slotted compensator significantly improves the controllability of the Suomi KP/-31 submachine gun by reducing muzzle climb. While originally omitted due to concerns about snow ingress, its effectiveness in mitigating recoil during automatic fire is clearly shown.

Chapters

  1. 00:00Introduction and Objective
  2. 00:33Live Fire Comparison
  3. 01:17Results and Design Philosophy
  4. 03:00Historical Shooting Technique

Frequently Asked Questions

Does the Suomi KP/-31 compensator improve controllability?

Yes, live-fire tests conducted by Forgotten Weapons show that the slotted compensator significantly reduces muzzle climb on the Suomi KP/-31, making automatic fire much more controllable and easier to manage.

Why was the Suomi KP/-31 compensator not included originally?

The original designer, Aimo Lahti, reportedly omitted the compensator due to concerns that snow and ice could pack into the vents, potentially causing malfunctions in cold weather conditions common in Finland.

What is the 'nose-to-receiver' shooting technique?

This technique, demonstrated by a Winter War veteran, involves placing the shooter's nose against the receiver end cap and looking over the top of the firearm with both eyes open. It's found to be surprisingly effective for close-range control.

What are the key technical specifications of the Suomi KP/-31?

The Suomi KP/-31 is a 9x19mm Parabellum submachine gun with a straight blowback action. It typically uses a 71-round drum or a 36-round stick magazine and has a rate of fire between 750-900 RPM.

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