I should clarify. I bought one, actually two, for the express purpose of using them to tame muzzle jump. When installing them for that purpose you must fine-tune the diameter of the hole the bullet exits from. Not only couldn't my gunsmith get the first one to work to tame muzzle jump, I had BP themselves adjust the second one I purchased and they coudn't tame the muzzle jump either.
My goal was to use their technology to enable me to use lighter weight rifles and still be able to see bullet impact on game. (I usually hunt without a spotter-partner.)