I just installed a set of Mepro's on my new / used G22. I noticed that the rear sight, when seated, allows a small amount of light between the sight and dovetail slot along the top of the frame. Does anyone know if this is normal or is it just my luck? I've mounted / re-mounted them a few times, but still encounter the same condition. It's noticeable when bringing the pistol up to eye level and acquiring a sight picture. All of my handguns have Trijicons and I don't have this problem. Any feedback / suggestions will be appreciated. Thanks.