Sig Sauer P320 Custom Legion | Steiner MPS

Published on September 15, 2023
Duration: 11:45

This video details a custom Sig Sauer P320 build, transforming an M17 into a 'Legion' inspired firearm. The presenter highlights modifications including a Custom Works FCU, tungsten grip module, Pro Cut slide with lightning cuts, Steiner MPS optic, SilencerCo threaded barrel, Go Guns USA Gas Pedal, and a Springer Precision extended magazine release. The build emphasizes aesthetics and improved handling, though it results in a significantly heavier pistol.

Quick Summary

This custom Sig Sauer P320 build, starting from an M17, features a tungsten grip module for added weight, a Sig Pro Cut slide with lightning cuts, and a Steiner MPS optic. The pistol weighs 3 pounds 6.5 ounces with a 17-round magazine, and its mass helps manage recoil despite a high bore axis.

Chapters

  1. 00:40Custom P320 Legion Build Intro
  2. 01:06FCU and Trigger Details
  3. 02:15Legion Grip Module and Weight
  4. 02:35Sig Pro Cut Slide
  5. 03:00Optic Mount and Steiner MPS
  6. 04:30SilencerCo Barrel
  7. 05:03Go Guns USA Gas Pedal
  8. 05:50Streamlight X300 Ultra Issues
  9. 07:00Magazine Release
  10. 07:30Pistol Weight and Balance
  11. 08:15Recoil Impulse Analysis
  12. 09:38Holster Choice

Frequently Asked Questions

What modifications were made to this Sig Sauer P320?

This Sig Sauer P320, originally an M17, features a custom Sig Custom Works FCU, a tungsten grip module, a Sig Pro Cut slide with lightning cuts, a Steiner MPS optic, a SilencerCo threaded barrel, a Go Guns USA Gas Pedal, and a Springer Precision extended magazine release.

How much does this custom Sig P320 weigh?

The custom Sig Sauer P320, configured as shown with a 17-round magazine, weighs approximately 3 pounds 6.5 ounces. This significant weight is largely due to the tungsten grip module.

What are the advantages of the tungsten grip module on this P320?

The tungsten grip module adds substantial weight to the P320, contributing to a more stable shooting platform. This added mass helps to mitigate recoil impulse, making the firearm feel more manageable despite its high bore axis.

Are there any issues with accessories on this custom P320 build?

Yes, the presenter noted that the quick-detach version of the Streamlight X300 Ultra light rattles and loosens under recoil on this specific P320 frame. They recommend the crossbolt version for better stability on P320s.

What optic is mounted on this custom Sig P320?

A Steiner MPS red dot sight is mounted on the custom Sig Sauer P320. It's attached via a modified CH Precision Weapons adapter plate, as the standard Legion plate interfered with the optic's fit.

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