We've seen some variance in the outside diameter of the Piledriver barrels over the past few months, so we recommend that you very carefully measure your barrel's OD with a set of accurate calipers and give us that measurement so we can machine your adapter to the correct size before we send it out. Make sure to take a precise measurement with an accurate tool so we get it right as custom adapters are not returnable.
You will need an adapter for the Piledriver in order to add a suppressor. Here is the link for the adapter:
For the Suppression I highly recommend the Emperor .45/.50 M18x1.