>>1908770a p320 variant will be the US Army's new sidearm (this doesn't include the Navy, Air Force, etc). and yes you can do drop in conversion kits on that gun. 9mm NATO is standard but just like today, special operations forces choose whatever they want anyway. maybe conversions will happen when needed, or maybe they'll use entirely different guns when needed. for instance, you might want suppressed, subsonic. the p320 wouldn't work for that. also they are eyeballing the addition of 7.62 NATO or .308 win. but 5.56 NATO would still be used.
