I think the issue here is a reducer fitted behind can look like the paddle when the paint has been shot off it making it a problem for shooters later in the session so the fact that it is a reducer is not obvious to some people and some scopes, most of us have some blur at some distances. Where a front mounted one is plain to see even when it is beaten up.
Making the target fair for the whole session has to be the priority here.
HFT, for people with only 2 buttucks!
VooDoo TwoTwo The next chapter.