I'm changing my rear sights on a Glock 17. This is my first set I've changed but I spring for a MGW sight tool. Is there any trick to lining up the rear sight on the slide? I've been trying to eye ball it, use my micrometer and everything to get it in the middle but there's really no goo point of reference that you can place your micrometer jaw against. It looked close but I shot it today and it was 1" left at 15 yards. Trial and error or is there a trick to it? Also, is it possible that even if I have them lined up on the slide that they could still be off bore?
I shoot a Beretta 92. I replaced my rear sight and just took the tool to the range with the ammo i shoot regularly and adjusted it till it was hitting POA. I believe different ammo might hit to a different POA, So use an ammo you can get most always.
Over the years I've used a dial indicator, an edge finder in the mill, a depth mic held against the slide and my eyeballs to look for center.
All will get you close - but in the end you've just gotta shoot it and go from there to know the POA and POI match up.
(I bet you've heard that before