/3/ - 3DCG

Hi /3/
What is a good starting software for simple mechanical modelling and function testing like proof of concept animation? specifically firearms receivers and trigger groups, lots of lateral movement, threaded surfaces, pivoting, captured spring/guide-rod assemblies, and spring tensioned cams. working in metric measurements.

I have limited experience with Blender, and started looking into Fusion3d when I remembered this board was here.
does it matter what software I pick? or is there one that is more ah, mechanically, oriented rather than the really cool artistic stuff

>gif related is more textured than what I need, but basically what I'm trying to accomplish.