I have a Kolar combo 30 inch o/u with Kola chokes ic bottom and mod top. I love shooting doubles with mine.
Bought a Kolar T/A combo 34/30 to replace my Beretta combo 34/30 that I shot for 15 years. Really struggled with the O/U. Took it to the pattern board and discovered I needed a different hanger to change the POI. Used a shotkam and discovered I was overswinging and shooting in front of the second shot on doubles. After a new hanger and some practice to slow down my swing I am crushing doubles. If I had to do it over, I would buy another Kolar, but I might buy a 32" O/U.