Nearly any spyder model will shoot the same as as the Bt omega. However it has a less durable design and will not look as "milsim" as the Omega was built for.
only if you buy the electric trigger.
No, it will not fit.
No, the BT omega does not have any rails to mount any sights on. A custom rail would need to be fitted and drilled into the handle to support any sights.
6600 fps
275 fps
360 FPS
Should run fine, probably around 45-60 fps. But the only way to get that exact fps is to go do it yourself. Plus, it depends on server latency, other players in the instance, etc. Sorry I can't help more.
Witch ever you can find the cheapest, they are (nearly) identical in looks and identical in performance. The bravo one is based on the Tippmann 98, and the omega is based on the BT4. The 98 and Bt4 are internally identical.
24/25/50 fps
The BT Tower in London, UK is 189 metres
You can purchase BT connect from many packages online. There are many questions and answers, simple and complex found online at BT Openzone wireless broadband.