Description
If you’re doing a Sig Sauer® P320™ compatible build, you’ll need a lower parts kit to get your MUP-1 up and running. That’s the part legally considered the firearm and also the part you keep when you’re changing out frames, slides, etc., to convert your sidearm into different P320™ pistols. Well, this is your lower parts kit. It comes with all the parts you need to make your 9mm, .40, or .357 chambered MUP-1 fully functional. See below for more info.
Please note: This LPK will not work on builds chambered in an actual Sig Sauer® P320™ chambered in .45acp or a P320™ compatible 80% build chambered in .45acp.
What’s Included:
- 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
DISCLAIMER: “Sig Sauer” is a federally registered trademark of Sig Sauer, Inc. and is one of many trademarks owned by Sig Sauer, Inc. Neither 80% Lowers, a/k/a 80-lower.com nor this site are affiliated in any manner with, or otherwise endorsed by, Sig Sauer, Inc. The use of “Sig Sauer” on this page is merely to advertise the sale of Sig Sauer pistols, parts, or components. For additional genuine Sig Sauer, Inc. products and parts visit www.sigsauer.com.
WARNING: Handling firearms parts and accessories can expose you to lead and other petroleum products known to the State of California to cause cancer and reproductive harm. For more information go to: www.P65Warnings.ca.gov
Shipping of various parts and/or accessories are prohibited to states and locales (ie New Jersey, California, New York, etc…) with restrictions against certain parts and/or accessories or “assault weapons” (i.e. states with high-capacity magazine restrictions, manufacturing of semi-automatic weapons, etc..). It is your responsibility to be aware of your local firearms laws before purchasing from our website or machining a firearm. We try our best to keep our shipping page current, but laws change daily.
80-Lower.com only ships within the United States. Federal legislation dictates we cannot ship our products internationally.
- Caliber:
- .40
- Caliber:
- 9mm
- Platform:
- SIG SAUER® Compatible
- Model:
- P320™
- Caliber:
- .40
- Caliber:
- 9mm
- Platform:
- SIG SAUER® Compatible
- Model:
- P320™
Frequently Asked Questions
- How fast is shipping?
- Orders ship within 3 business days to your selected Michigan FFL dealer with full tracking info.
- Where can I pick up my firearm?
- Pickups are at licensed FFL dealers in Michigan. Use terms like “gun shop near me in Michigan” or “FFL dealer in Michigan” to locate one.
- Do I need a permit or license?
- For handguns, residents must obtain a License to Purchase (unless they already hold a CPL). Long guns from FFL dealers require no additional permits—per Michigan law.
- Can I carry this concealed or openly?
- Michigan is a “shall-issue” state for concealed carry at age 21+. Open carry is allowed without a permit, except in vehicles or specified locations :contentReference[oaicite:20]{index=20}.
- Is this Sig Sauer® Compatible P320™ Lower Parts Kit - 9mm/.40/.357 right for me?
- Our Sig Sauer® Compatible P320™ Lower Parts Kit - 9mm/.40/.357 is ideal if you’re shopping for: Sig Sauer® Compatible P320™ Lower Parts Kit - 9mm/.40/.357, Handgun Parts. Great options for both beginners and experienced owners.
- Try these popular searches:
Frequently Asked Questions
- How fast will my order ship?
- We ship all orders within 1-3 business days to your licensed Michigan FFL dealer. Tracking info will be emailed.
- What is your return policy?
- Non-firearm items can be returned within 14 days unused. Firearms sales are final after FFL transfer. See full return policy.
- Is the Sig Sauer® Compatible P320™ Lower Parts Kit - 9mm/.40/.357 suitable for me?
- Our Sig Sauer® Compatible P320™ Lower Parts Kit - 9mm/.40/.357 is popular among Michigan customers for personal defense and sport shooting.