I use a Vortex Crossfire 4-16x on mine, full 22" match barrel.
As for a mount, I would skip the Springfield one. It's not very well suited because of the massive gap in the rails over the chamber. Get an aluminum Sadlak mount. I have Medium height Warne rings, but I have to crane over the gun to get the proper eye relief. Might replace it with a Burris PEPR cantilever mount...