Hey guys. Well, after 3 months of waiting, I finanly recieved my brand new Remington XR-100 rangemaster in .223 Rem. Man, what a nice looking rig!! I was as giddy as a school girl waiting to get out and shoot it. I headed straight down to the local gun shop to get some bases - I have rings already. I was told that the XR-100 has the same dimensions as a model 7. I purchased a Weaver 1 piece mount. I take it home, and ITS THE WRONG ONE!! It was for the older style model 7 with only the 3 hole receiver - the XR-100 is the new style with 4 holes. Now, my question is, will the base still work? When I put it on, only the very outside edges of the base were contacting the receiver, there was a large gap through the middle of the base where it wasn't contacting the reciever. Is that enough contact to make the base still usuable? Or am I needing to get a whole new base? Any help would be appreciated, since I want to get out and shoot the damn thing already!! Thanks.