I bought the 100ATR in .270 for my wife. It's the black synthetic scoped combo. It came boresighted and took about 5 shots to get it sighted in really well. My wife has never shot a gun before and she was shooting 1" 3 shot groups at 100 yards. I was seriously impressed for a $299 deer rifle. I've been considering a new rifle for myself lately and also looking for a starter rifle for my kids. Mossberg makes the 100ATR in a Super-Bantam model that would be great for the kids, but I want the 4x4 Mountain rifle in 30-06.
Starting this year all 100ATRs come standard with a fluted barrel and all 4x4's come standard with fluted barrel and muzzle break. Their website says you can get them in 30+ calibers, but I don't see all of that on the specs. I see: 243, 25-06, 270, 308, 30-06, 300 Win Mag and 338 Win Mag.