William, Yes I think they had to dove tail the front sight. I took it to the gunroom in lakewood and the guy there did it for me pretty cheap about $100.00 for the Tritium Nightsights and $45.00 for insulation. This is really funny. The first time I took it out of town with me I set it on the night stand by the bed and woke up every hour or so and pointed it at the door. LOL! I remember saying go ahead make my day! lol! [roll]Originally Posted by AR Will