For a Steel Challenge gun, get a lightweight barrel of your choice. The problem isn't swinging from target to target, it's stopping the momentum. A lightweight barrel is easier to stop.
Regarding the trigger, I would go with Brimstone. They are a little pricey, but your kids will have these guns for 60 years or more. Sounds like you guys are having fun no matter what your decision is.
I'll check into the Brimstone.
We'd prefer something a little heavier than stock. We shoot a lot of SC and I got my GM card last summer with a 15-22. The light barrels are easier to stop but they also don't settle quite as well. Trying to find somethings just a little beefier.
