9x39mm Basics with Piedmont Cartridge

Published on September 2, 2019
Duration: 17:07

This video explores the 9x39mm cartridge, a Russian round optimized for subsonic, suppressed use. It highlights how the 9x39mm is derived from a 7.62x39mm case necked up to 9mm, typically firing heavy 245-275 grain projectiles. The discussion covers the engineering challenges in adapting AR and AK platforms for this low-pressure round, particularly regarding gas systems and magazine compatibility, and compares its subsonic performance to .300 Blackout for applications like hog hunting.

Quick Summary

The 9x39mm cartridge is derived from a 7.62x39mm case necked up to 9mm, firing heavy 245-275 grain projectiles at subsonic velocities. This design makes it exceptionally quiet when suppressed, often measuring 125-130 dB, with the firearm's action being the loudest sound.

Chapters

  1. 00:00Introduction to 9x39mm
  2. 00:43Cartridge Technical Details
  3. 01:22Suppressed Performance
  4. 02:07Engineering Challenges (AR/AK)
  5. 03:08AK Platform & Magazines
  6. 05:38Hunting & Comparison (.300 BLK)

Frequently Asked Questions

What is the 9x39mm cartridge based on?

The 9x39mm cartridge is essentially a 7.62x39mm case that has been necked up to accept a 9mm projectile. It's designed to fire heavy bullets at subsonic velocities for suppressed use.

How quiet is the 9x39mm when suppressed?

When suppressed, the 9x39mm is exceptionally quiet, with shots typically metering around 125-130 decibels. The mechanical action of the firearm often becomes the loudest sound heard.

What are the main challenges in building AR/AK platforms for 9x39mm?

Building AR and AK platforms for 9x39mm requires significant modifications. The primary challenge is the very low gas pressure, necessitating moving the gas block much closer to the chamber for reliable cycling. Magazine compatibility is also an issue.

How does 9x39mm compare to .300 Blackout for hunting?

For subsonic applications, 9x39mm offers a larger diameter and more projectile mass than .300 Blackout. This makes it a potent choice for suppressed hunting, particularly for larger game like hogs.

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