I shoot IDPA with my glock 40. sometimes were rolling on the ground
and sometimes sitting whatever. So far i've not had a problem.
I'm not the only one with a GLock.
For CCW, an unloaded gun, is someone without a gun. A better way
to put this.... if you ever need it, you'll need it quickly, you will never
have the time to rack the slide...
There is another choice you could carry a wheel gun.