S&W 13-4 Military Police Magnum .357 mag
I bought this new in the mid 1990s, it's still my favorite.
I have tried many grips over the decades



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Here's a PC13 with some elkPHP:![]()
OP, I think you have either an N-frame or a K-frame square butt Pachmayr grip adapter on there... it's a bit too long and splaying out from the bottom. Those things are hen's teeth but they do come up on ebay now and then.
The only other FBI-issued grip I ever saw on a Model 13 was the Pachmayr Professional Compact. They started putting it on the guns for new female agents at the Academy whose hands were too small for the usual grip+adapter. Three girls in my class in 1986 had them, and later as an instructor I recall seeing about a half dozen others. Not all female agents had them.
Beautiful find!
PS. Not sure if I told this story previously, but I ended up returning my Model 13-2, in lieu of carrying my own personally-owned revolvers. My issue gun broke it's hammer nose twice in the 13 weeks of the academy during firearms training. I wasn't new to shooting and I thought something else must be wrong with that specimen to keep breaking hammer noses.... that revolver wasn't new to me either as it had some slight muzzle blue wear. After graduation, during my third quarterly field qualification, the hammer nose broke for a third time. That was enough for me! Turned it in and started carrying these:
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