So i wrote this to the support request and they ask me to post it here instead. Well here is it.
"Hi i recently make the gun Sentenza and i find a few things off about it.
From Blackhawk to Sentenza, I realized that there's a DECREASE in the range of the bullet. I'm not sure whether it is made that way to make it different from the Silversix series(Silversix series' bullet range keep increasing as per upgrade.) So the range of Blackhawk's bullet is the range of Argent Peacemaker and vice versa for the other two. I find it strange that there isn't anything else to Sentenza that makes up for the range reduction. Also,under the Sentenza description at the wiki, it stated this
"Six shot clip of shadow/piercing bullets. Relatively fast firing speed. Increased damage to slimes and undead."
However, when i fire it at slimes and undead, the damage number came out in grey in color. And i supposed that that means not very effective. I hope you guys can take a look into it and give me a reasonable reply. Thanks."
Increased damage to slimes and undead
Nope.
Slimes are resistant to Piercing and weak to Shadow, so it would be neutral against them.
Undead are resistant to Shadow and Neutral to Piercing, so it would also be ineffective against them.
Sentenza only deals additional damage to Beasts and Gremlins.