80% P320 Compatible Insert MUP 1
The Modular Universal Pistol 1, or MUP 1, 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 .45 ACP (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.
