I just got off the phone with Tech Support at Troy and they said that the rail must be removed to remove the Galil's top cover. That was fairly evident from the photos, but there it is direct from the manufacturer.
I'll have to decide whether of not this is a deal-breaker for me. I like the Galil platform, but modern red-dot sights offer so many advantages. Currently, I'm running a cut-down UTG rail (I sawed off the portion that extends back over the receiver) with an Aimpoint T1 out atop the forend. The surgury on the UTG wasn't about top cover removal (it's high enough to allow the top cover to be removed). It was about that portion of the rail blocking access to the charging handle. Given that the Galil lacks a bolt hold-open, every reload involves running the bolt. Making this harder and slower to do just didn't compute, so out came the hacksaw.
In one sense, it is nice that Troy has kept the rail nice and low. However, on my UTG experiment, I initially mounted the T1 using the factory integral mount. It was too low, in that I saw way too much front sight hood in my optic's field-of-view. The full protective "ring" of the Gaili front sight contributes to this. If it were AR-style "wings" it would be better. I switched to a low LaRue mount and it raised it enough to improve the situation. Higher would be better in terms of a clear field of view, but even the low LaRue mount puts the optic a bit too high. Useable, but a bit too high.
Rosco