Perhaps your question is to complicated.
It is not a problem that you have with software
but you have a problem with converting a 2d drawing into 3d.
I can not help you with such a complicated issue and i believe other feel the same..perhaps if you try to find some tutorials/YouTube on the net this might help you in your quest.
I truly hope you succeed in your search..
Bilal, I've read a number of your questions...there is never a question. I've seem many of your model uploaded. I can't believe that you can do that work, yet not model many of the questions you post.
Finally specifically for me, I do not work on weapons - period.