Sporterising a perfectly good K31

Published on February 8, 2026
Duration: 12:56

This guide details the process of sporterizing a Swiss K31 rifle, focusing on improving accuracy through glass bedding and scope mounting. The expert instruction from Polenar Tactical emphasizes non-permanent modifications to preserve historical value while enhancing performance. Key steps include stock preparation, precise bedding, and the installation of modern optics.

Quick Summary

Sporterizing a Swiss K31 rifle involves enhancing its performance, often through glass bedding the action for improved accuracy and stability. This process ensures a precise fit between the receiver and stock, potentially outperforming barrel free-floating for this model. Adding a scope via a non-drill mount further boosts aiming capabilities.

Chapters

  1. 00:00Introduction to 'Sporterized' K31
  2. 00:30K31 History and Caliber
  3. 01:00Key Features: Straight-Pull Action
  4. 01:33Trigger and Safety Mechanism
  5. 02:05Barrel System and Accuracy
  6. 03:05Initial Accuracy Testing
  7. 05:08Accurizing Theory: Glass Bedding
  8. 06:45Stock Refinishing and Preparation
  9. 08:21The Glass Bedding Process
  10. 11:04Final Results and Scope Mounting

Frequently Asked Questions

How can I improve the accuracy of my Swiss K31 rifle?

Improving a K31's accuracy often involves glass bedding the action to ensure a solid, consistent fit between the receiver and the stock. Unlike many modern rifles, free-floating the barrel may not always yield better results for the K31. Proper stock preparation and the addition of a scope can also enhance precision.

What caliber is the Swiss K31 rifle?

The Swiss K31 rifle is chambered in the 7.5x55mm Swiss caliber. This is a powerful and accurate cartridge known for its high ballistic coefficient, making it suitable for precision shooting and historical rifle enthusiasts.

What are the key features of the K31's action?

The K31 features a distinctive straight-pull bolt action, which allows for rapid cycling without the need for rotation. It uses a 6-round detachable magazine but can also be loaded via stripper clips. The rifle also has a quality double-stage trigger.

Is it possible to mount a scope on a K31 rifle?

Yes, it is possible to mount a scope on a K31 rifle. Non-drill, clamp-on scope mounts are available that attach to the receiver, allowing for the addition of modern optics without permanent modification to the firearm.

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