JSD Supply MUP-1 Frame

$99.00 - $264.00
(11 reviews) Write a Review
Calculated at Checkout



This is a new JSD 80% frame to build yourself a custom or self-built P320. It will work with any P320 9mm, 40SW or 357SIG (not manual safety without modification). Will also work with 45ACP with minor modifications. All GEN 3 frames fit the new drop parts (frame tab cut). Please note these are now the Gen 3 P320 frames offered by JSD. Inside is laser marked by JSD, among other minor changes. Frames are still compatible with JSD jigs. (Add a discounted jig above).

Frame requires finishing to be a complete firearm. All city, state and Federal laws apply when manufacturing your own firearm. Engraving is available for an additional fee. Engraving info can be found HERE.

Includes: 1 JSD Supply MUP-1 (SIG P320) Unfinished Frame (Manual safety cut available for +$55) (Discounted jig available for +$110).

FCU Parts, Barrel, Slide, etc. are obviously NOT INCLUDED. 

No FFL is REQUIRED. THIS IS NOT A FIREARM. JSD has their ATF determination letter stating this is not a firearm.

See our option to add the manual safety pocket to your existing frame: Manual Safety Cut

11 Reviews Hide Reviews Show Reviews

  • 5
    JSD Supply MUP-1 Frame

    Posted by Spence on Aug 23rd 2021

    I've built every P320 There is from Full Size 9mm to .40 S&W Sub-Compact. This is the best 80% Gun on the market in my opinion. I've built every Polymer80 Glock they have so far, All AR's (AR-9/10/15/.40&.45acp). I'm a mechanic by trade but no one will ever take my build's no matter what! Over my dead body Biden Prick! Protest to Survive!!!

  • 5

    Posted by Chris on Aug 19th 2021

    Fast delivery, excellent part, very simple process will definitely be ordering my future build parts from AB Prototype

  • 5
    well made unit

    Posted by Ralph Koon on May 31st 2021

    very professionally made

  • 5

    Posted by Barrett Grubb on Jan 27th 2021

    Excellent frame and jig.....Not hard for someone with medium gunsmithing experience to complete with their jig and instruction videos...these sigs are a bit pricey to build in comparison with glocks but in the end the trigger capability on the sig is much better and I guess you get what you pay for to an extent....overall happy with the purchase and shipping was amazingly quick during a time when a lot of places are late getting stuff out.

  • 4

    Posted by Marc Silberberg on Jul 9th 2020

    Broke two bits on the #39, but was all around easy to do.

  • 5
    Sig mup

    Posted by Oswaldo Herrera on Feb 22nd 2020

    Well made.

  • 5
    worked excellent just take your withit

    Posted by ron on Jan 25th 2020

    good stuff

  • 5
    Excellent Customer Service

    Posted by j on Jan 24th 2020

    Excellent customer service. Walked me through some issues with my build and got it resolved!

  • 5

    Posted by Steve on Aug 3rd 2019

    You will not find better customer service , faster shipping, or better prices.