The P320 by Sig Sauer® was a great addition to our industry. It introduced the idea that you could have one pistol, but that you could modify it to be adaptable to any carry situation. They did it by defining the insert or the "guts" of the P320 as the legal "firearm," so that you could modify everything around it, thereby changing its carry size and profile. If you're looking for a new pistol with that same end-all/be-all feel to it, that same one-and-done idea, but you want to build it yourself and without that new pistol price, then you too need to start with the piece the government considers the "firearm."
Starting a P320 build? Read the Build Guide first!
Once you have that piece, you'll need the jig that will allow you to finish the remaining work to be for for the insert to be functional. We're excited to bring you the necessary jig. The Jig for the P320-compatible MUP-1 will guide you and serve as a template for the remaining work to be done in order for the insert to be completed.
To finish the insert and make it ready for use, use this jig to complete the following steps:
- Drill all holes
- Bend side rails
- Trim rails to size
For a great overview on these steps, check out JSD Supply's informational video here.
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 Tactical Gear Heads, LLC 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
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