On my carry, first I make sure that the gun has had a least 1k rounds through it to make sure it's reliable...Second, I change regular sites to nighties. Third, and most important is practicing with the gun in a local pistol match. Know it, live it, love it and learn it. When you're under the clock, and have people watching you...You'll be amazed at the "wtf gun didn't go bang???" theory...
Um, dumbass...you're out of ammo, time to reload!!! Upham! Upham! where the fuck is my mag??? Stress reloading, is an amazing trait to learn and master, after learning how to count your shots. Modifying your gun is second, modifying your gray matter is first..