Pienoiskivääri m/91 Finnish .22 Mosin Trainer

Published on November 21, 2025
Duration: 14:23

This expert-level entry details the Pienoiskivääri m/91, a Finnish .22LR training rifle conversion of the Mosin Nagant M91. It covers the historical context of its development, the unique Solerno barrel refurbishment process, specific modifications to the bolt and firing pin, and its intended use for low-cost marksmanship training. The entry highlights the rifle's rarity and its significance in Finnish military small arms history.

Quick Summary

The Pienoiskivääri m/91 is a rare Finnish .22LR training rifle conversion of the Mosin Nagant M91, featuring a barrel re-lined via the Solerno process. Its modified bolt and firing pin allow it to safely fire .22 rimfire cartridges, offering minimal recoil for effective marksmanship training.

Chapters

  1. 00:06Introduction to Mosin Nagant Trainer
  2. 01:02Conversion Kit History and Finnish Arsenal
  3. 01:43Solerno Process and Barrel Conversions
  4. 02:14Production and Book Promotion
  5. 03:18Rifle Features: Barrel and Sights
  6. 04:16Markings and Receiver
  7. 05:21Bolt Conversion Details
  8. 06:41Firing Pin Modification
  9. 07:13Solerno Process Scandal and Production End
  10. 08:30Second Contract and Total Production
  11. 08:57Unit Issue and Usage
  12. 09:09M27 Rifle and Delayed Conversions
  13. 09:40Post-WWII Developments and Obsolescence
  14. 10:19Sales and Distribution
  15. 10:47Later Availability and US Importation
  16. 11:19Range Test and Shooting Experience
  17. 12:24Recoil and Shot Group
  18. 13:18Sighting and Marksmanship Training
  19. 13:57Conclusion and Book Promotion

Frequently Asked Questions

What is the Pienoiskivääri m/91?

The Pienoiskivääri m/91 is a .22 caliber training rifle conversion of the Finnish Mosin Nagant M91. It was developed by Finnish defense forces to provide a low-cost option for marksmanship training using readily available .22 rimfire ammunition.

How were the barrels of the Finnish Mosin Nagant .22LR trainers modified?

Finnish forces utilized the Solerno process, developed by AVT1, to refurbish worn Mosin Nagant M91 barrels. This involved drilling out the original barrel and re-lining it with a new barrel suitable for .22 rimfire cartridges.

What are the key mechanical differences in the bolt of the Pienoiskivääri m/91?

The bolt features a modified bottom rail that acts as a sliding extractor. This mechanism engages the rim of the .22 rimfire cartridge, holding it in place and extracting the spent casing upon opening the bolt.

Why are .22LR trainers like the Pienoiskivääri m/91 beneficial for marksmanship?

.22LR trainers offer virtually no recoil and use inexpensive ammunition, making them ideal for beginners to focus on fundamental marksmanship skills like sight alignment and trigger control without the distraction of heavy recoil.

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