GLOOB,
The pistol is a Tanfoglio 9mm I was running in production class. It's a DA/SA. A second trigger pull is much faster than a tap rack. If the primer doesn't go on the second pull, you've lost a few thousands of a second before the tap rack. If it does fire you've saved the time required to do a tap rack, and you've not had to break your grip on the pistol. Had I been running a 1911, I would have automatically gone to tap rack as there is no second strike capability. USPSA stands for United States Practical Shooters Association. In these matches it's all about time and accuracy. Shaving a few hundredths of a second off here and there while getting good hits determines the winner. Fortunately misfires are extremely rare, usually a result of a high primer, dirty firing pin channel, or light springs that have lost their tension. You should find a match in your area and check it out.
Shoot well,
str1
edit: I'd have that PA63 checked out. Misfires with modern center fire ammo are extremely rare.