A couple months ago I went to the range to sight my carbine. By the time I had it lined up, the aperture was over against the sight frame but basically centered on the receiver - in other words, the sight base was pushed over too far. Later I marked everything, knocked the sight base loose and reset it with Loctite in the correct position. Today I go back to the range expecting to maybe make minor adjustments with the windage screw, and it was shooting way right. I couldn't figure what happened. I finally got it lined up but the aperture was all the way over again. I guessed I had made a mistake somewhere and brought it home. Later, putting it away, I took another look at the sight and saw what had happened - the sight base, although appearing to be solidly fixed, had shifted in the receiver. It won't move by hand, but must have been jarred on the way to the range or maybe it moved from recoil. This time I use RED Loctite!
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