I gave up on calling after I didn't receive any phone calls back or no answers. I measured the primer crush as requested for the aftermarket BP. I do have a .002 primer crush stock. which according to them it should be enough for a clean primer but it isn't. So I'm assuming I need a little more crush but the shims you mentioned are in .005 increments. Which would put a .007 crush on the primer. Is that to much do you think or should I order some shims and try it? I want to make sure I get the right amount of primer crush for a clean seal before I order a BP.