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Gmountain: If the owner of the pistol will permit you to do so, take the slide off and see what kind or recoil spring arrangement the pistol has. It may have the old dual-Delrin (composite) spring and composite guide rod. If it is one of the "early" runs check to see if it has the "bridge" of metal over the slide stop hole. If it is of the later type, the metal over the slide stop hole will be nonexistent.
Check the area where the slide stops against the frame. Look for signs of extensive "peening" the battery of the slide against the frame. If it shows excessive wear, pass on the pistol. In the early models, if the "bridge" of metal is still in place, a qualified gunsmith can remove it, without diminishing the frame's integrity.
All of the "upgrade" advice after you buy the pistol still stands. (e.g. FLGR, flat-bottomed, stanless steel EGW firing pin stop, 22-24 lb. recoil spring, 24-26 lb. mainspring, and extra-hard slide stop from Wilson Combat, are still advisable.)
I hope that this helps.
scott
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