I am modeling a gun and after I got the main part of the gun done but have come upon a large problem.  There are many small details on the gun and I concluded to use Booleans to get the detail I wanted.  My problem comes when I go to do the operation.  I bring in my shape that I would like to preform a Difference on.  When I do this both the gun and the shape disappear.  I’ve gone to a different scene and performed the operation and it worked fine.  I can’t figure out why this is happening… Any help would be greatly appreciated.  I could get pictures up if you need them.  Thanks.

I’ve run into that from time to time. Usually because one of the objects isn’t “closed"--one face has been deleted somewhere. That’s the only reason I’ve ever figured out anyway. There may be other causes.

Thanks I’ll check that out.  I’e mirrored the model which might be the problem but I don’t know.