Saw a post by geraldskip wondering how to get more weight in the gen 3 Glock grip so I thought i'd post what I did.
I was able to get a little over 5oz flush fitting in my gen 3 glock 17 grip. Previously had a 2 ounce grip plug in it from Dawson.
I bought tungsten putty and tungsten shot (for the higher density) and mixed them together. Then lined the inside of the grip with a thin layer of epoxy, and shoved it in. Once inside the tungsten putty allows it to mold to the backstrap shape. Added a little more epoxy after insertion to lock it in. Once cured, sanded the epoxy flush and painted. Can't even tell it's there unless you really look, and the shape of it acts as a small magwell.
Don't have any pics of finished product but do have a couple of the in progress. Could up the weight even more by increasing the ratio of tungsten shot to tungsten putty.