If the gun drops to the ground he is DQ'ed.
COF begins with "Make Ready" command
10.5.3 If at any time during the course of fire, or while loading, reloading or
unloading, a competitor drops his handgun or causes it to fall, loaded
or not. Note that a competitor who, for any reason during a course of
fire, safely and intentionally places the handgun on the ground or other
stable object will not be disqualified provided:
8.3.1 “Make Ready” – This command signifies the start of “the Course of
Fire”. Under the direct supervision of the Range Officer the competitor
must face down range, or in a safe direction as specified by the Range
Officer, fit eye and ear protection, and prepare the handgun in accordance
with the written stage briefing. The competitor must then assume
the required start position. At this point, the Range Officer will proceed.