Sig Sauer P320 Lower Parts Kit


(4 customer reviews)

In stock

Sig Sauer P320 Lower Parts Kit Product Details

This Patmos Arms lower parts kit for Sig Sauer P320 has all the lower parts used to complete your P320 Fire Control Unit including:


  • 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
  • O-ring
  • 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


This is an upgraded kit with new drop-safe components. These Patmos Arms P320 Parts are compatible with any upgraded Sig p320 slide in 9mm, 40 S&W and 357 Sig.

Parts You Can Rely On

Here at JSD Supply, you’ll find all of the compatible parts for Sig P320 firearms that you need for a complete build.

Since 2013 JSD Supply has been a reliable source for parts and tools to build your own pistol or rifle. We offer useful tools along with P320 parts and more that can help you assemble a weapon that looks, feels, and operates identically to stock weapons by their original manufacturer. Get a sleek weapon the way you want it and ensure that you’re protected.

Place Your Order Today

You’ll be able to build a custom reliable firearm with a few simple tools and our Sig P320 parts.

Order here with JSD Supply and expect fast shipping with expert customer support.

Shop Related Products

Reviews for the Sig Sauer P320 Lower Parts Kit

4 reviews for Sig Sauer P320 Lower Parts Kit

  1. Daniel (verified owner)

    FCU once assembled fits fine in compact and full size frames but is incredibly right on the subcompact and requires you push the disconnect bar back in place because it’s so tight when you rotate the take down level. But over all it works great and has been reliable for 300 rounds so far.

  2. Alex Mack (verified owner)

    Flawless. On par with- if not better performance than factory Sig FCU parts. Will definitely buy from them again and recommend this kit to anyone!

  3. Tommy (verified owner)

    This LPK isn’t Sig OEM, it’s made by Patmos Arms. I wish they would’ve been more clear about this instead of just stating that this “LPK is an upgraded kit with new drop-safe components” which I mistook as Sig OEM Post-Recall LPK with the flat trigger instead of the curved one. I only mention this because I was specifically looking for a Sig OEM LPK, I wouldn’t have bought this had I known about it.

    The quality of the parts and manufacturing is great, there are no burrs, sharp edges or defects. The finishing is good and are either polished, nitrided, or phosphated. The phosphated parts are the trigger, slide catch/release, and takedown safety lever. The trigger has the enhanced geometry of the Legion X5 Skeletonized flat trigger but just without the skeletonizing. The trigger geometry is the “upgrade” in this LPK. I’m pretty sure that the parts are MIM, but I cannot verify this. While this may not be Sig OEM, it’s a great quality LPK but only time and more rounds will truly indicate its quality.

  4. Eric (verified owner)

    Loved this build, full sized on Wilson Combat fits like a glove!

Only logged in customers who have purchased this product may leave a review.

Shop by Category

Shop by Brand

Recent News

Overhead view of a man cleaning his disassembled firearm

Tips for Cleaning Your DIY Firearm

Find out the proper steps for cleaning a gun, how to do it safely, and why it can be an important part of spotting damage or customization opportunities. We’re proud to offer quality DIY firearms parts and accessories that don’t break the bank. Order your gun parts from JSD Supply today.

Read More »
A DIY firearm with a pull-release trigger installed

Pull-Release Triggers Explained

Pull-release triggers can legally double your rate of fire with a semi-automatic firearm. Learn how these custom trigger groups work and the benefits they offer at the range. Order your firearms parts and accessories online from JSD Supply today.

Read More »

Update on the 80% Receiver Rule Appeal

The Fifth Circuit Court of Appeals has vacated the District Court’s ruling and remanded the ATF’s new 80% Receiver Rule back to the lower court for a ruling on its merits. This victory reaffirms your right to make your own legal guns at home. We’re proud to help lead the fight for your Second Amendment rights.

Read More »