Find Weapons_server in \Battlefield Heroes\mods\bfheroes\Objects
Remember. Make backup of Weapons_server.
Open it. Go to Handheld folder. Find files of weapon you use.
Default_....con and those in folders. For example: BRI_Shotgun.
Copy Default_...con and files from folders to somewhere, better create folder for them.
You must copy all files of that weapon. (ex: Default_BRI_Shotgun.tweak, BRI_Shotgun_con from BRI_Shotgun folder, BRI_Shotgun_FastLight_1.con from BRI_Shotgun_FastLight_1 folder and BRI_Shotgun_SlowHeavy_1.con from BRI_Shotgun_SlowHeavy_1 folder)
Right mouse click on tem, choose Properties and make turn off Read Only.
Now you can edit them and save changes.
Open all files. Find line: ObjectTemplate.ammo.reloadTime x (x means the number of time for reloading weapon) Change x for 0. And its done. No reload ^^ Now replace with them original files in Weapons_server.
I will make VID if it will be needed XD