[LHB1]

Be careful doing a "throat and polish" job. A little bit goes a LONG way and too much at the wrong place or angle can ruin a barrel or a frame. Just a few of the dangers (not necessarily all):
1. Don't change the angle of feed ramp.
2. Don't shorten the gap between top of frame and bottom rear edge of barrel.
3. Don't round the edge too much where the barrel throat changes angle and becomes the barrel chamber.
4. Don't polish thru the anodized surface of aluminum frame.