Looking for advice on the factory base rail that come with the MOD 11/111 LRH 338 Laupa. Has anyone else had problems with this coming lose? Are you using the factory rail or have you replaced it with a high quality steel rail? I know that the Torx screws changed with the 338 Laupa to 8/40 threads. Any recommendations on a quality rail? I just got the gun in December, put a NightForce NSX on it and was working up a load, first firing was OK, had some sub 1/2 MOA @ 100 yrd, then the second round of refining the shot groups went crazy, open up with flyers had to stop. Was in the process to remounting and checking the scope and found that the base was not tight. I checked this before mounting the first time.