So I got a Gamo swarm Magnum, generation 1, in 22 caliber. Anyway I wasn't sure why this top rail that came with the gun had a break in it. I decided to mount my bkl scope rings right over it just to see if it would hurt or not. I didn't have any of the pellets that normally shoots so I shot a few that were close in weight. Anyway I wasn't happy with the groups and I'm thinking this is the problem. I've got one of those one piece rails with the mounting stud that goes in the hole at the top of this rail on the gun but I'm not sure it's going to get my scope far enough back like I want it. But anyway I guess I'm going to have to change these out and try it. So anyone have any idea why this top rail, the one right underneath the silver bkl Mount, is split like this? My Swarm Whisper has one that's a solid unit. I wouldn't think that even using a two-piece mount you could Mount one on one side of the split and one on the other because that would still defeat whatever purpose it serves. What's everybody's thoughts on this? Thanks.