Jig for 80% P320 Compatible Insert - MUP 1

(7 customer reviews)


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JSD Supply is the ultimate choice when you want to custom build a pistol in your garage. Since 2013 we’ve offered top-quality 80% jig kits and other essential tools needed to construct a variety of handguns. With our pieces you can create a unique firearm without the hassles of a background check or serial numbers. The jig kit gives you a piece that looks, feels, and operates like those from the manufacturer without the paperwork.

Complete Kits for Easy Builds

Building your own handgun is simple and satisfying with one of our 80% jig kits. Each kit includes a jig, top plate, and drill bits—all you need is a drill press to get started. We even provide detailed instructions and completion videos to ensure a smooth build.

The operations needed to finish your insert are:

  • All Holes
  • Bend Slide Rails
  • Trim Rails to Size



See the difference one of our jig kits can make for your handgun needs today whether you are new to building handgun or an experienced pro.

Custom Firearms Without the Hassle

Our extensive inventory has you covered from Sig P320 jigs to other tools needed to build a firearm. Every piece has been fully tested to guarantee complete satisfaction, and our team of experts is available to answer any questions about our products. With great pricing and hassle-free shipping, JSD Supply is the best way to get a firearm without the paperwork.

Download Instructions

Completion Videos:

YouTube Channel

Additional information

Weight 32 oz

7 reviews for Jig for 80% P320 Compatible Insert – MUP 1

  1. argon (verified owner)

    the precision is amazing on this piece ….and im a machinist . very very well made

  2. Steven Speidel (verified owner)

    A+++++ Excellent and amazing craftsmanship! Very helpful customer service and fast shipping! JSD answered a question I had within minutes . Thank You!!

  3. [email protected] (verified owner)

    Nice but could use 4 small drill holes for manual safety to be machined in .
    Like the slot on other side .

  4. Erik (verified owner)

    Awesome product. Definitely more to pay attention to than other 80 percent projects. But as long as you follow the right drill press speeds it will come out correct. I rushed and had my press set too fast and ate through one of the bits that came with it. Good thing I had a spare. Definitely without a doubt use cutting oil. Will make the job way easier. If you rush it you will bend the frame. I had to bend it back into place. Jig helps to bring it back into shape. I wish the rails were already cut to lenght because it’s hard to cut the extra material off. Not impossible though. Pay attention to the smaller drill bits because they are not marked. I’m assuming because they are so small. But overall great products. Will buy more from here again. Thanks again for creating this. Another 80 added to the collection.

  5. Eugene (verified owner)

    I’m a happy customer, this project is a little more involved than I had initially thought, but JSD supply has been super supportive and responsive with all my questions/concerns. Bought a second Jig even, and will most certainly support what ever 80% project JSD comes out with in the future.

  6. Mr. Joshua (verified owner)

    Great JIG was easy to use and a well machined tool. I will continue to buy my parts from JSD Supply. Happy customer shipping was quick very little lead/wait time I cant complain.

  7. TomB_TX (verified owner)

    Very good jig, precisely machined and easy to use – a bargain at the price. Likewise the MUP1 is excellent quality. I used my shop press for bending the tabs instead of a hammer, and my mill for sizing the tabs to get a better fit than the hacksaw suggested. also used a 3/32 carbide mill to cut the safety slot, and used more precise cobalt drills instead of the supplied drills to get cleaner holes. Made an excellent FCU.

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