Anyone ever have to file the lug under the sight base that fits into the picatinny rail. I purchased these new from Springfield and the back one went right on. The front one is really tight on the front picatinny rail. I tried it on the back section of the picatinny rail and it would fit right on. So the front picatinny rail lugs must be a little wider. I went ahead and filed the one side of the lug under the front sight base that fits between the picatinny rail lugs and now it fits. I'm new to this so I hope it was the right thing to do?