South African Army .22 Rimfire Conversion for the R4

Published on January 18, 2019
Duration: 11:15

This guide details the installation of the South African Defense Force (SADF) .22LR conversion kit for the R4 rifle, developed by Thor Engineering. The kit allows for low-cost training by converting the rifle to fire .22LR ammunition using an open-bolt blowback system. Expert Ian McCollum explains the process, highlighting the unique sear interaction and the use of a modified Mauser magazine. The guide emphasizes careful assembly for proper function.

Quick Summary

The SADF R4 .22LR Conversion Kit by Thor Engineering enables the R4 rifle to fire .22LR rounds using an open-bolt blowback system for training. It features a unique bolt with a ridge for rimfire ignition and adapts a Mauser MN410B magazine, requiring the rifle's hammer for operation.

Chapters

  1. 00:00Introduction: SADF R4 .22LR Conversion
  2. 01:13Mechanism Overview: Open-Bolt System
  3. 01:46Magazine Design: Mauser Adaptation
  4. 02:12Disassembly and Components
  5. 03:28Firing Pin and Sear Mechanics
  6. 06:27Installation Process
  7. 08:58Range Testing and Functionality
  8. 10:09Conclusion and Comparison

Frequently Asked Questions

What is the SADF R4 .22LR Conversion Kit?

The SADF R4 .22LR Conversion Kit, developed by Thor Engineering in Johannesburg, allows the South African R4 rifle to fire .22LR ammunition. It operates via an open-bolt blowback system, primarily intended for cost-effective soldier training.

How does the R4 .22LR conversion kit work?

This kit uses an open-bolt blowback mechanism. It requires the R4 rifle's full-auto hammer to function, even if the rifle is semi-automatic. The bolt has a ridge to strike the rimfire cartridge, and a modified Mauser magazine is used.

What components are included in the R4 .22LR conversion kit?

The kit typically includes a bolt carrier stand-in, a .22LR bolt with a rim-striking ridge, a chamber insert, a locking piece, and a new recoil spring, along with a modified magazine housing for a Mauser MN410B magazine.

Is the SADF R4 .22LR Conversion Kit complex to install?

While functional, the kit is considered complex due to its unique open-bolt operation and specific sear interaction requirements. Proper installation requires careful attention to detail, as demonstrated by expert Ian McCollum.

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