This is sort of a Model 52/39 post. About a year ago a friend of mine was about two steps ahead of me at the local gun show. He stumbled into an extremely good deal. A gentleman was selling a Model 52 S&W with several magazines and a spare set of grips for $1100.00. My friend bought it. Then the gentleman said I will sell this spare upper in 9 MM with a couple of magazines that fit that frame for $200.00 more. That was a no brainer. Along with the whole set up came some paperwork. It seems the Model 52 was used by the Illinois State Police Pistol Team. Their armorer bought M39 uppers directly from S&W and fitted them to the Model 52 frames. The 39's do not shoot as well as the 52's, but still do pretty good. Wish I had been in the lead that day.

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USMC 69-93 Combat Pistol Inst.