Some few ounces, for practical purposes. If you want a lighter gun, this is not a very productive place to start. If you are intending to move the balance closer to the trigger and/or lower swing efforts, you may get some results. Note that the muzzle is the farthest point from the muzzle, so metal removed in the muzzle zone will have much more effect on balance and swing effort than will weight removed near the balance point. Calculating the weight removed is not mathmatically difficult, but it can be very complex. If you want to run some examples, post back and do the math for you.
DDA
