About $30.
I would also recommend getting a LW barrel for your Marauder and calling it a day...I have a LW on my .22 and .25 M-rods and no ground squirrel is safe up to 125 yards .Henry
also, forgot to mention, peep the crown on your old barrel too! if that old one is trashed, bust out some tools, perfect opportunity to learn how to cut and polish a crown. =) i re-do all of my AR15 barrels since they come from the factory looking like trash. i have seen some pretty shoddy airgun crowns too.. atleast the AG barrells are softer steel and eaiser to clean up and polish.