In addition to lenghtening the mag well and beefing up the recoil spring, when Martz does this conversion, he also changes the toggle ramp part of the frame, so that the toggle opens wider for the 6mm longer case. He also opens up the breech face for the wider semi rimmed 38 Super case. I do have a couple of PO8 breech blocks that he opened for 38 Super or .40 S&W @$75 each. TH
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