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During his stint as a Police Officer, Batman didn't allow Grayson's police-issue gun in the Batcave.
Batgirl (Cassandra Cain) and Batgirl (Barbara Gordon) once faced each other in combat however the girl under the mask turned out to be Harley Quinn instead of Barbara Gordon.
A Battle of Hypothetical Proportions appeared in Wizard Magazine #112, January 2001, pitting Batgirl (Cassandra Cain) against Batgirl (Barbara Gordon). The battle's outcome has Batgirl (Cassandra Cain) winning.