I recently had an event with the 501st. The only aspect of my costume that I wasn't pleased with happened to be the Westars. Kids want to hold them and when they see your Rubies Westars they know that they have the same ones. Takes something away from it. So, I did a quick mod until I can get some quality pistols.
One thing I did was take them apart and add weights to the inside of the grips as well as a steel bar inside the brass tube. This mod alone really gave these toys some added weight which makes them feel more realistic. Some chrome paint, a brass intake tube, a little sand paper, and Bob's your Uncle!
Keep in mind these are in no way going to replace a set of MR's or something that has been made to spec. I did this entire mod in a day and was pleased enough with the finished product to think that I might actually take some time and try to produce another set with better quality results.