Saving wear & tear on your ISP Model 39 is a good idea, as some of them date to 1967. Mine (inventory #415) dates to 1967 or '68. I bought it back from ISP when ISP went to the 439 (around 1980). A couple of years ago, the external part of the 2 piece safety/decocker came loose from the internal part that blocks the hammer. I was hoping that someone would weigh in on your question re putting a 39-2 slide on a Model 39.
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