There are about a gazillion new 1894's out there in gun shops with the micro groove barrel. Just know what your lookin for. In either event the 1/38 twist rate on the new Marlins will never reliably stabelize a bullet over 300 grains. I believe the Cowboy 2 model that Marlin put out had a 1/20 twist rate with ballard rifeling. This is the model you want if you want to primarily shoot hard cast bullets over 300 grains or at least a faster twist rate with the ballard rifeling.