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

80% P320 Compatible Insert - MUP

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Your Price: $99.99
Retail Price:$149.99
You Save:$50.00(33%)
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Part Number: MUP1
Availability: In Stock. Free Shipping.
The new 80% Sig Fire Control Unit (Modular Universal Pistol or MUP), is compatible with current P320 upgraded parts, including SIG’s line of “drop safe” firearms. You can use this insert to make a 9mm, 40 S&W, 357 SIG, and 45acp (with slight modifications). That means this SIG P320 insert is extremely versatile. Design a SIG P250, a P320, or even put it in the EXO-1 Chassis system.

This quality insert is made from type 316 stainless steel, so it will last you through years of use.

With this insert, you have a base from which to build your new favorite firearm. 

To finish the insert, you need to complete the following:

Drill All Holes
Bend Slide Rails
Trim Rails to Size

Complete all of the operations on your MUP insert with a drill press jig (sold separately).




DISCLAIMER: We do not provide legal advice or legal counsel. It is your responsibility to understand the respective State laws and Federal laws. This product is to be installed by a competent gunsmith. No liability is expressed or implied for damage or injury which may result from installation or use of this product. These inserts require milling and possibly fitment of the various parts included. We do not provide build and/or gunsmithing advice.

Due to the legal nature of these inserts, we do not accept returns or exchanges on these inserts once machined or altered in any way.

Please note that we cannot ship these to the state of New Jersey or DC.

Washington state residents will need to provide a copy or photo of their Drivers License and Concealed Pistol License prior to shipping. Email them to us at [email protected]


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