How to export an asset and associated components into another project.

I have found a cool weapon in another project. Is there a easy way I can export this weapon and all it's dependencies, Muzzle flashes, particles, crosshairs and associated scripts. Then import that package into another project?

If I use "export package" then I have to carefully go through a large list, find all the associated components, and hope that I have everything which I wont because I didn't build it.