This would appear to be the ultimate:"Do you prefer cake or pie?"
I believe the reason the FBI guns were mandated without FLGR's was the
decision to err on reliability over accurracy.
As the comments in this thread indicate to the casual (or keen) observer is
that it really doesn't make a lot of difference.....
When you check in a technical manual about a certain issue, and there are
7 possible solutions offered, it generally indicates that either they ALL work
satisfactorily, or NONE of them do....
In this case, both 'solutions' to the technical problem ,(FLGR vs NFLGR), are
fine!