Bukkit

What steps will reproduce the problem?
1.Item_Type: using item like 276
2.use this gun
3.left click mob

What happened?
Weapons are worn

What was supposed to happen?
Doesn‘t worn

What version of CrackShot are you using?
0.98.1

What version of CraftBukkit/Spigot are you using?
MCPC

Were there any errors in the console? If so, what were they?
Nothing

Please provide your configuration file if necessary.
Nothing

Issue with tools id type of gun

What did you mean exactly?

I am still unclear about your issue but assuming you are saying left clicking something with your tools like pickaxe or swords, crackshot does not prevent the durability change. In fact, I believe it cannot be "stop".

There are some plugin that prevents you having infinite durability on tools. These type of plugins are usually removing the tools from your inventory and giving you back exact same name after 1 tick. I think Shampaggon know this and probably not going to "fix" because it is too risky for future update.

You will need external plugin for preventing the durability damage and it has to support UTF-8 format. I use Essentials's /repair all command and executing it every 2 minutes using Skript.There are a lot of workaround for repairing durability automatically. Try find your best way.