New SCAR 17 (NRCH) - Can I update my old SCAR?

Published on January 3, 2022
Duration: 19:48

This expert guide details the FN SCAR 17 NRCH, focusing on its Non-Reciprocating Charging Handle (NRCH) system. It explains the history, design changes from older models, and the internal mechanism that allows the charging handle to remain stationary during firing. The guide confirms that older SCAR models cannot be factory-upgraded to the NRCH system due to receiver modifications.

Quick Summary

You cannot upgrade older FN SCAR 17 models to the factory NRCH system because the new design requires specific internal receiver modifications, including a unique 'shelf' and pin, which are absent in previous versions. The NRCH system keeps the charging handle stationary during firing, preventing 'SCAR thumb'.

Chapters

  1. 00:00Intro: New SCAR 17 NRCH vs Old SCAR
  2. 01:08SCAR Program History & Original Design
  3. 02:44The New NRCH System Explained
  4. 04:41External & Internal Comparisons
  5. 07:20Disassembly & Mechanism Deep Dive
  6. 12:16Upgrade Compatibility Check: Can Old SCARs Be Updated?
  7. 18:07Price, Quality, and Final Thoughts

Frequently Asked Questions

Can I upgrade my old FN SCAR 17 to the new NRCH system?

No, you cannot directly upgrade older FN SCAR 17 models (Belgian or early US) to the factory NRCH system. The new system requires specific internal modifications to the receiver, including a unique 'shelf' and pin, which are absent in previous versions.

What is the main advantage of the FN SCAR 17 NRCH?

The primary advantage of the NRCH (Non-Reciprocating Charging Handle) system is that the charging handle remains stationary during the firing cycle. This prevents potential 'SCAR thumb' injuries and allows for more flexible grip techniques when manually cycling the action.

How does the NRCH mechanism work on the SCAR 17?

The NRCH system utilizes a 'shuttle' or 'sled' mechanism. This shuttle connects the charging handle to the bolt carrier only when manually cycling the firearm. During live fire, a pin within the receiver disengages the shuttle, allowing the charging handle to stay put.

What are the key differences between the US-made SCAR 17 NRCH and the original Belgian SCAR 17?

Externally, the US NRCH model often features a nitride/blued barrel finish and multi-tone FDE, contrasting with the Belgian's parkerized barrel. Internally, the US receiver has a crucial 'shelf' to accommodate the NRCH shuttle system, making factory upgrades impossible for older models.

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