SIG P320 Compatible Lower Parts Kit, 9/40/357

Sig Sauer P320 Lower Parts Kit


33 in stock

Upgrade your Sig Sauer P320 with this comprehensive, drop-safe Lower Parts Kit designed for compatibility with 9mm, 40 S&W, and 357 Sig calibers. Complete your build with ease and confidence using this all-in-one solution.

Transform your Sig P320 with the P320 Compatible Lower Parts Kit, ensuring safety and compatibility with multiple calibers. Experience seamless upgrading with U.S. Patriot Armory’s enhanced, drop-safe components.

33 in stock


This lower parts kit for Sig Sauer P320 Compatible ( 9mm /.40 Cal / 357 Sig ) Lower Parts Kit

We have the parts you’r looking for so you can get your new build completed. This lower parts kit for Sig Sauer P320 kit will work for 9mm, 40 S&W, and 357 Sig calibers. This kit includes all necessary components to complete your Sig Fire Control Unit or 80% P320 MUP-1. U.S. Patriot Armory has enhanced the kit with new drop-safe components, ensuring quality and safety.


Drop-Safe Components:

  •   This is an upgraded lower parts kit with new drop-safe components.


  • These P320 Parts are compatible with any upgraded Sig p320 slide in 9mm, 40 S&W and 357 Sig.

Included Parts:

  • Trigger stop pin
  • Slide catch lever pin
  • Safety lever pin
  • Sear pivot pin
  • Split coil pin
  • Slide catch lever spring post
  • Take down safety lever
  • Safety lever
  • Slide catch
  • Sear
  • Oring
  • Take down lever
  • Slide catch assembly
  • Spring, slide catch lever
  • Spring, sear (2)
  • Trigger bar spring
  • Spring, takedown lever
  • Flat Faced Trigger
  • Trigger bar
  • Sear housing
  • Manual disconnector

Frequently Asked Questions

What are the benefits of the Sig Sauer P320 Compatible (9/40/357) Lower Parts Kit?

The Sig Sauer P320 Compatible Lower Parts Kit offers a complete solution for upgrading or completing your P320, ensuring compatibility with various calibers and improved safety with drop-safe components.

Is this kit compatible with other calibers besides 9mm?

Yes, this Lower Parts Kit is compatible with 9mm, 40 S&W, and 357 Sig calibers.

Are the components in this kit drop-safe?

Yes, this kit has been upgraded by U.S. Patriot Armory with new drop-safe components to enhance safety and reliability.


Additional information



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