I have a 22lr/22mag New frontier and it shoots high like 1" at 10 yards and 3-4 inches at 25yards with the rear sight all the way down. I noticed that the rear blade is a bit higher than the holder and the square notch could be ground down a bit more and the top could be ground down a bit more as well.That should help and I would do it myself if I knew how to extract the rear sight blade from the holder. Who can do this?Im in Long Island, NY. Or should I send it to Colt? I also would like to get the trigger lightened and crisper.Anyone come to mind for all this? Finally when the bolt inserts into the slot the lock up has a little play,is this normal or should it be tight?