The only recommendation I have heard along those lines, is the older 2-pin frames should not be converted to .40 or .357 (see post #2 in this thread for an image comparison of a 2-pin and 3-pin frame). The third pin stabilized the locking block better in the frame, and along with a larger/stronger locking block introduced at about the same time, greatly improved durability in the larger calibers over the long term.
The third pin was introduced somewhere in the middle of the Gen3 model run, so you will find some Gen3 9mm full-size Glocks with 2-pin frames, and some with 3-pin frames. I've always been told that 3-pin frames can be safely converted to .40 and/or .357 (given the correct parts, of course).
...The second most dangerous thing to do is Turning Your Life Around. Going by local news reports, if you start Turning Your Life Around, you will inexplicably wind up face down in a convenience store parking lot at 0300 with a bag of somebody else's money in your hand, a chalk outline, and half a magazine's worth of the taxpayers' bullets in your ass. -- Tamara K.
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