Home Forums Hunting & Shooting AR and Tactical Rifles Forged, Cast, or Milled?

On the second receiver from the right you will see a little square bump sticking out right below where the pistol grip attaches. As a raw forging this is a 1/4" wide extrusion that sticks up from the inside of that nice curve. It is where the metal flows into the seam of the forging mold. All the manufactures machine this off but in different ways. That double radius is hard to cut and you can see how some makers mill it with a large flat while others use a radius cutter to make a nice smooth curve.

On an all milled receivers the manufacturers use the correct radius cutter because they have to cut the large curve instead of having it forged into shape.