I know of 3 or 4 ASI Supermatch Rifles that are in use, mine was used for bell target along with a friends. \
We had 3 of them up on the range last year shooting at 10mtr targets, then one of the chaps was shooting his at .22 blanks at 40yds and setting them off..... all with Diopter sights.
Superb triggers on them as well.