Disgracefull behavior - I agree totally with Andy and Ian above.

It goes without saying these inserts which Phil has developed are a part ( arguably a small part ) of his complete compensator upgrade offering - simply fitting them in place of the stock inserts will achieve very little - you need the complete upgrade for them to become truly effective.
For example, the lug on each insert in the above picture is for removing the insert via the new access hole in the compensator bell housing which is created as part of the upgrade - and is not in the standard housing.
The complete upgrade also includes further detailed changes.
So doing so misses these new inserts primary purpose of being exchangeable in situ without having to remove the engine.