I guess you would get magazines from Mossberg. You would get the 4x4 magazines. Maybe the Patriot uses the same magazine.
PS, I like the Trophy Hunter a lot. The stock is nice and solid, the rifle cycles easily, the bolt is super smooth, I like the magazine a lot, it's just a lot of rifle for the money. The scope it comes with is good enough for me out to 200 yards, holds zero just fine. My only complaint would be the recoil pad -- it's thin and hard, not much help.