Quite a few emails have asked about tritium vial installation, and one this morning raised the question about installing the vials in the existing grooves of Download's Pocket Rocket 8:
I will bore mic my PR8, then outside mic the body, as well as depth mic the existing grooves. It appears that the grooves may already be about 1.0mm deep, meaning that an additional 0.5mm of groove depth would allow a 1.5mm trit to sit flush.
If this works, I plan to put one trit at each end of the three grooves - 6 trits total. Will post back with measuring results & hopefully photos