So it begins. The Sig 320 is going to change the way we think about firearms. The EXO ONE (X01) is a patent-pending multi-caliber exoskeleton for the Sig Sauer P320 Fire Control Unit (FCU). In 20 seconds, you can change your 320 pistol into a legal, bigger, more capable pistol with no FFL and no tools. This is just the beginning.

The X01 body is injection-molded with glass filled nylon. It can accept SIG® MPX//MCX buttstocks and arm braces.  This is a pre-release concept. Read more at
This is the first of many designs. There is no reason to stop at a modest pistol conversion. There will be soon be rifles and carbines. Remember this?
Ghost Guns is going to make 80 percent Sig 320 Fire Control Groups. Look for and many other companies to produce all manner of parts and accessories for the 320. I don’t know where this is going but it is going to be fun.
Photos courtesy of