I have an o5 RX-1 mtn. It is a factory 151. I want to change to 7 tooth 3.0 drivers and 162 track. I am having a lot of trouble finding rail extensions for this. Tracks USA says that the rx-1 is different than the rx-1 mtn. I have tried Hartman but they must be closed as no web site or phone. MPI has not replied yet to my emails but it may just take some time. Is the mtn rx-1 rail the same as the mtn apex? Any help guiding me in the right direction is appreciated
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