A friend's father gave him a T/C Renegade 54 Cal percussion. Externally, it's in relatively good condition, but barrel cleaning was non-existent and it was stored in a humid climate. Needless to say, the inside of the barrel is a rusted out sewer-pipe. He is considering selling the rifle to me, and I'd like to get it re-barreled. Is there someone you guys could recommend who sells a drop-in replacement? I found barrels only online. Any help with this will be appreciated. Thanks...Shooter.