Removing accurate perk from mauser? ...
Also 9mm bullets is the main problem really, yes mauser sux, only 5-10 damage, but bullets... even worse, it's just 1/1 without negating DR or multiplier.
There're also 9mm balls bullets when you completing Wright's quest at New Reno, these are even worse, because they have simply 1/2 damage mult, so your mauser will deal 2-5 damage...
Edit: just look wiki, it's opposite: 9mm ball 1/1, and just 9mm is 1/2.