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my brother did it to his, before marlin made them that way. he bought a tube extension for a cowboy, and had the mount moved on the barrel. he said it holds six in the mag.
sorry for the crappy pic, i stole it from his post on another site. he also made his own large loop.
bignix...head over to Marlin Owners Forum and look under 45/70. There are a few threads about mag extensions. One fellow is offering carbon fibre tubes too.