RN 50 Accident Preliminary Analysis

Published on May 12, 2021
Duration: 3:20

This analysis by firearm designer Mark Serbu provides a technical breakdown of an RN-50 accident, debunking rumors about pressure limits and heat treatment. It highlights the importance of proper ammunition and clarifies differences between prototype and production models, emphasizing safety features.

Quick Summary

Firearm designer Mark Serbu clarifies that the Serbu RN-50 breech cap threads, made of 4140 Steel (Rockwell C30), require 161,520 PSI to shear, debunking lower pressure rumors. He emphasizes that all production RN-50s feature heat-treated caps, unlike prototypes, and suggests ammunition issues were the likely cause of an accident.

Chapters

  1. 00:00Introduction & Rumor Debunking
  2. 00:11Pressure Calculations & Thread Strength
  3. 00:59Heat Treatment Clarification (Prototype vs. Production)
  4. 01:29Secondary Safety Features
  5. 01:46Ammunition Analysis (Counterfeit Rounds)
  6. 02:20Conclusion: Likely Cause

Frequently Asked Questions

What is the calculated pressure required to shear the threads on a Serbu RN-50 breech cap?

Based on engineering analysis of the 1.5-12 threads in 4140 Steel (Rockwell C30), the calculated pressure to shear the threads is 161,520 PSI. This is significantly higher than the 85,000 PSI rumor that circulated online.

Are all Serbu RN-50 breech caps heat-treated?

No, only production RN-50 breech caps are fully heat-treated. The prototype shown in older videos, potentially with Royal Nonesuch, was not heat-treated, but this has been corrected for all manufactured units.

What were the potential issues with the ammunition used in the RN-50 accident?

Analysis suggests the ammunition may have been counterfeit, lacking proper manufacturing features. It's also possible the rounds were loaded with fast-burning pistol powder or had a dangerously low charge, leading to detonation.

What are the secondary safety features of the Serbu RN-50 receiver?

The RN-50 receiver includes 'ears' which are steel components designed to provide additional containment. These are robust enough to handle a significant portion of the normal bolt thrust on their own.

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