Does anybody know the source, or have the voodoo to DYI, for smaller apertures for vernier sights??? I have BPCR w/ 050, 060, and 070. I have noticed a definite difference in accuracy with smallest hole. I would now like to go even smaller. Any suggestions???? I have tried some searches without success. I am aware of Hadley device at Buffalo arms and wonder how far down those holes go.
Thanks!!!