While I do not live in the Holperin / Simac district, I had to watch all of the ads on TV. No mention was made by either side regarding 2nd amendment views, so I presume they are about equal on that regard.
If Holperin was an open anti-gunner, he would not get elected in the Northwoods of WI.
The recent CCW law in WI did receive some support from Dems.
Although I was rooting for Ms. Simac.