Ok this work, found here: http://gembundler.com/ (Also pasted below)
I hope it helps someone else finding this...
Run an executable that comes with a gem in your bundle
$ bundle exec rspec spec/models
In some cases, running executables without bundle exec may work, if
the executable happens to be installed in your system and does not
pull in any gems that conflict with your bundle.
However, this is unreliable and is the source of considerable pain.
Even if it looks like it works, it may not work in the future or on
If you want a way to get a shortcut to gems in your bundle
$ bundle install --binstubs
$ bin/rspec spec/models
The executables installed into bin are scoped to the bundle and will