Trivia: Brief mentions are made of Liu Kang being a descendant of a warrior named Kung Lao, and a statue of Kung Lao can be seen faintly in the courtyard that is filled with statues. In the games, Kung Lao is actually the name of two characters - one an ancient and famous warrior, and the second one of his descendants, whom is both related to and good friends with Liu.
Trivia: The original script reportedly had much more violence, which the studio had removed for a PG-13 rating. The original script also made Liu Kang and Princess Kitana's potential romance a bigger focus, whereas in the finished film, it's more subtle and implied, and the romance doesn't fully play out. (Although they are implied to be in love and entering into a relationship by the end of the sequel).
Answer: Sonya's pistol looks to be a Glock, Model 17 or 19. It looks like the barrel was broken off up to about the front end of the trigger guard. If she fired it like that, the bullet would have significantly reduced muzzle velocity because the recoil spring is gone (it would be in the front part of the weapon that was frozen and broken off.) The remaining part of the slide wouldn't have any resistance working against it. Not only would that result in less pressure inside the chamber during firing, but it would also most likely send the slide back into Sonya's face if she pulled the trigger.
Mobrien316