I had a 669 and explored modifying 6906 grip panels to fit rather than grinding the grip frame. I found a couple of threads on this site where a member did that successfully. I suggest searching that out first before you grind the frame. It’s easier to replace a plastic grip panel than the grip frame.
I agree the stock grip panels leave a lot to be desired, particularly the early ones. Ultimately I traded off my 669 because of the 669’s poor, for me, grips and the smallish sights.
Merc6,
I'm embarrassed to say that that is a promag mag.
It worked in my 469 but doesn't work in my 6906.
However, what I've done for the 6906 is use a 59 series base plate and, once again used a belt sander to contour the front edge.
Nice work, Merc6!
I guess you've seen my thread where I modified 3rd gen grips to fit a 2nd gen 659.
I have recently modified a set of 2nd gen 469/669 grips to slim down my 3914.
Stay tuned...
John
I seen a few don't think it was yours.