I bought a set of Yankee Hill machine risrs for my new R-15. They look great, but wont' fit over my rail. They have to go on from the end and be pushed to where I want them. Problem is, they are way to tight. I can probley beat them on, but it will scuff up my rails and take the camo finish off. I've also got a set of Leupold Mark 4 rails on order that I'm going to try as well. Will these be the same? Any ideas..?