MPX-SD K is Fast AF boi... and gassy too lol

Published on April 30, 2026
Duration: 1:36

This video showcases the SIG MPX KSD, a Scottsdale Tactical exclusive, firing Iconic USA 147gr ammunition. The reviewer notes the firearm's rapid firing capability and significant gas blowback, particularly when shooting left-handed. The setup includes a HoloSun 503C U optic with a KDG quick mount and a Phantoms brace, which helps mitigate muzzle rise.

Quick Summary

The SIG MPX KSD, a Scottsdale Tactical exclusive, is a fast-firing PCC with notable gas blowback, especially for left-handed shooters. It's recommended for home defense and is shown equipped with a HoloSun 503C U optic and a Phantoms brace to manage muzzle rise.

Chapters

  1. 00:01Introduction to SIG MPX KSD
  2. 00:05Scottsdale Tactical Exclusive
  3. 00:08Shooting Iconic USA 147gr Ammo
  4. 00:34Reloading Mags
  5. 01:07Hot Firearm & Gas Blowback
  6. 01:08Left-Hand Eject Advantage
  7. 01:12HoloSun Optic Setup
  8. 01:14KDG Quick Mount & Phantoms Brace
  9. 01:21Brace Functionality
  10. 01:24Shoutout to Scottsdale Tactical
  11. 01:27Bedside Firearm Recommendation
  12. 01:31Closing Remarks

Frequently Asked Questions

What is the SIG MPX KSD?

The SIG MPX KSD is a firearm described as a Scottsdale Tactical exclusive. It's a compact pistol-caliber carbine (PCC) known for its rapid firing capabilities and is suggested for home defense applications.

What ammunition was used with the SIG MPX KSD?

The reviewer used Iconic USA 147gr ammunition with the SIG MPX KSD. This specific ammunition type is noted in the context of testing the firearm's performance and sound signature.

What accessories are recommended for the SIG MPX KSD?

The setup includes a HoloSun 503C U optic with a KDG quick mount and a Phantoms brace. The brace is highlighted for its role in managing muzzle rise and preventing the brace from turning.

What are the performance characteristics of the SIG MPX KSD?

The SIG MPX KSD is characterized by its very fast firing rate ('Fast AF') and significant gas blowback, particularly noticeable for left-handed shooters. The Phantoms brace helps mitigate some of this.

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