4 hours ago, Green Shark said:
I want to ask you guys, what 3D modeling software should be used to make and sculpt weapons for games?
I second Blender for this. Else check Maya and 3ds Max, however you will be paying a lot extra for a easier interface with those two.
4 hours ago, Green Shark said:
how do you make it shiny LIKE metal?
The most important part is material like @swiftcoder said. However the normals are also a very large factor on producing the correct hard edge look for metal object.
Modeling weapons for games is not a overnight thing, it's going to take years of practice before you can make AAA game models. You also need to know how the weapon you are making works.
http://wiki.polycount.com/wiki/Subdivision_Surface_Modeling
http://wiki.polycount.com/wiki/Texture_Baking