A few remarks - 

   The comments of allyn yonge, CCMax, and others relate to a more
general point.  Ranma 1/2 is an over-the-top parody of chambara and
chop-socky martial arts films.  A fanfic author has to be careful when
mixing in elements from gritty realism, film noir, and similar such
genres.  The more "realistic" other elements and characters are, the
more difficult it becomes to establish and maintain the necessary
suspension of disbelief.  (Please note that this is different from
writing dark or serious Ranma fics  such as "Ill Met by Starlight".) 
Perhaps this is a reason why Ranma crossovers tend to use Sailor Moon
and Tenchi Muyo and don't seem to work well with a series such as Gundam
Wing.  Certainly, bullets would seem less threatening to someone who has
faced Herb and Saffron, or even Ryouga's attacks which seem to be able
to do more damage than any handgun. 

   Assuming that past events up to the failed wedding still occurred,
you will also need to justify the changes in Ranma's character, not just
his loss of identity, but his ease at killing, since the latter
represents a major alteration to Ranma's basic character.  

   As to the matter of Nabiki as hacker which does seem a bit out of
place with the rest of her career, I would suggest that Nabiki probably
would use some aquaintances in low places rather than acting as a hacker
herself.  In such a scenario, Nabiki would discover just how serious the
matter is if she were to discover that the hacker had met an unfortunate
fate.  As to why an attack with guns (which is unusual in Japan and
attracts much greater notice from the public) rather than knives or an
arranged accident, it may be that her enemy wishes to make a statement
to others.  

  - whimsy
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