I'm not sure about the grip frame? My Trooper Mark III was made around 1980 or 1981? I down't own a square butt version of the Trooper Mark III, to enable me to compare with mine. It's possible, that only the grips themselves were changed to the round butt style-but, then, leaving the grip frame the same as for the square butt model Mark III's?
I'm appreciating the nice comments coming in complimenting my Trooper Mark III!
The only J frames with a "round butt" are the 2" Lawmen. All other J frames are square butt. Those stocks are simply the "later" version Mk III target stocks with tapered/rounded wood. /forums/images/graemlins/cool.gif