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80% P320 Compatible Insert - MUP 1
80% P320 Compatible Insert - MUP 1

80% P320 Compatible Insert - MUP 1

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Your Price: $140.00
Retail Price:$150.00
You Save:$10.00(7%)
Part Number: 320MUP1-2
Availability: In Stock.
Quantity Price
3 - 5 $126.00
6 - 10 $119.00
11+ $112.00


Building a firearm in your garage is easy with help from JSD Supply. We offer a diverse inventory of parts like 80% lower inserts that make a great base for a variety of handgun projects. The Modular Universal Pistol 1 is compatible with current P320 “drop safe” upgraded parts and can be made into a 9mm, 40 S&W, 357 SIG, and 45acp (with slight modification). That makes it a versatile piece for different styles of firearms including Sig Sauer P250, Sig Sauer P320, and the EXO-1 Chassis system. It is also made from 316 stainless steel, so you know it will last for a long time.

Easy to Build Firearms

Since 2013 we’ve been the ultimate DIY firearm solution. With a P320 insert you have a great start to building a custom pistol right in your own garage.

The operations required to finish the insert are:

All Holes

Bend Slide Rails

Trim Rails to Size

All of these operations can easily be done with a jig a drill press – sold separately. By following basic instructions you’ll be on your way to having a firearm that looks, feels, and operates pieces available from the manufacturer in no time.

The Hassle-free Way to Get a Handgun

Whether you need an 80% lower insert or something else for your firearm project, rely on JSD Supply. Everything we sell has been tested by our team and they are happy to make recommendations so you can complete your build. Offering straightforward services and fast shipping, we are the hassle-free way to get a handgun without background checks or concerns about serial numbers.


Returns will not be accepted once the receiver is modified in any way.


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