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).