I tried carrying two guns on the job when I was a young cop and could never manage to make it work for me (my second piece a Chief's Special in an ankle holster). I came to realize that it slowed me down when movement might just be important so I quit doing that. That second gun was my off-duty weapon and for years I always had it with me if I was able to carry a sidearm... The last half of a 22 year career I made a serious up-grade of that "off-duty" item - and instead of something small - I made a point of always carrying my full sized service weapon (mostly 9mm or 40cal auto pistols) with me when off-duty. It took some getting used to but my reasoning was simple. If I ever really needed a sidearm off-duty - I wanted to be as prepared as possible.... By the way it is very possible to carry a medium frame auto pistol in an ankle holster when wearing long pants...