Thanks for all your responses,
Sounds like its normal for a Marlin to print low with factory sights. On a side note, I was shooting from a rest (so I was kinda hunched over the rifle). Would that have an affect on a low impact? The last round I shot was standing unsupported at a 25yd target and it was still a little low (I cant imagine that I moved that much to cause it, but I may be wrong).
Thanks for the info on the after market sights. I'll definately be on the lookout for them.