Receiver Lapping??

[montana]

The lapping compound should be cutting a groove of equal depth all the way around the tool. If it isn't, there is something wrong with the flux modulation in the gravitational forces caused by the squared speed of light. :-)

Absolutely true. I got a smiley face sticker on my squared speed of light test. I prefer the face of my tool to be flat. The deeper the groove becomes the more potential for the abrasive compound removing material from the side of the receiver barrel channel instead of just the face.