MP5SD at the Range: Subsonic vs Supersonic

Published on November 14, 2020
Duration: 5:25

This guide details a range test of the Heckler & Koch MP5SD submachine gun, comparing the acoustic signature of subsonic versus supersonic 9x19mm Parabellum ammunition. The test, led by firearms expert Ian McCollum, demonstrates the effectiveness of the MP5SD's integrally suppressed design and perforated barrel in reducing standard supersonic rounds to subsonic velocities. The conclusion highlights the weapon's ability to achieve effective suppression without specialized subsonic ammunition.

Quick Summary

The Heckler & Koch MP5SD's unique perforated barrel bleeds off gas, reducing standard supersonic 9mm ammunition velocity to subsonic levels. This design, combined with its integral suppressor, results in no audible difference between supersonic and subsonic rounds during range tests, effectively eliminating the sonic crack.

Chapters

  1. 00:08MP-5SD at the Range
  2. 00:17Ian McCollum with MP5SD
  3. 01:35MP5SD Barrel Design Explained
  4. 02:05Mixed Ammunition Test Setup
  5. 03:09Test Results and Conclusion

Frequently Asked Questions

How does the MP5SD make supersonic ammunition subsonic?

The MP5SD achieves this through a specially designed barrel that is perforated just ahead of the chamber. These perforations bleed off excess gas, slowing the projectile down below the speed of sound before it exits the integral suppressor.

Is there an audible difference between subsonic and supersonic 9mm rounds in an MP5SD?

During a range test with an MP5SD, firearms expert Ian McCollum found no discernible audible difference when alternating between 115-grain supersonic and 158-grain subsonic 9mm rounds, indicating effective suppression of the sonic crack.

What type of action does the MP5SD use?

The MP5SD, like many Heckler & Koch firearms, utilizes a roller-delayed blowback action. This mechanism is known for its reliability and smooth operation, contributing to the firearm's overall performance.

What are the fire modes on the tested MP5SD?

The specific MP5SD featured in the video was equipped with a trigger pack offering three fire modes: Safe, Semi-automatic, and a 2-round burst setting, which is considered ideal for an integrally suppressed weapon.

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