While this movie was mildly entertaining, there is a reason it went straight to video. Like phonebooth (but without the Colin Farrel nametag), it really lacked a strong plot. Depending on which way you saw each character, the movie could be pro or anti gun control - if you really look deep. You have a woman who runs a gun company and a psycho with a gun (obtained illegally as he has a criminal record) further gun control would not keep him from obtaining a gun.
The movie, while running the same "plot line" as Phonebooth, was not a ripoff of the movie, considering both came out the same year and, in fact, the production of Liberty started before Phonebooth was even cast.