First few passes to mill out ejector recess. Dremel used to start the groove for the ejector guide extension. The ejector will be about 3/16th's. Barrels 'short chambered'. The lumps will require a notch to clear the ejector. Once the ejector recess is finished, and the ejector made, the barrel recess cuts will be made to accommodate the ejector. After that, the monoblock should be ready to grind away all the excess, solder bbls. and lumps and start final fitting, then the bbls. final reaming.