Explanation: You can find all the weapon modificationsHERE or request for one HERE If you need anything else please don't hesitate to make another question or send me a private message. - Question Answered, moved to answered section.
Please remember that we only answer questions thats about the server and our community outside that is not important for us.
But don't worry friend i will help you here,
Here click this link http://www.gtainside.com/en/sanandreas/weapons-all/
Pick anyone that you want, make sure that you have IMG-tool.
Most of the mods need to be installed to GTA by using IMG-tool not all of the mods but most of them.
Thanks for your time, don't hesitate to ask more questions.