It's only supposed to have one bolt; yours is correct.

You can do one of a couple things as far as the suppressor if you're looking to go another route. MeanV sells his stoppers by themselves, and you can take out the "arm" of the Shortstop and flip it backwards and the stopper fits perfectly on the end of that rod as one option.

Of course, you can simply remove it and put the whole MeanV suppressor on there as well.