Do I need a bent bolt?
Yes. Due to the nature of having a full-length rail which extends over and past the ejection port, a standard sniper-style bent bolt is required to clear the underside of the rail.
The rail looks like it sits high up.
We designed the rail to sit as low as possible while still clearing the swing of the bent bolt. Additionally, you can adjust to a degree the pitch of the rail and thus lower or raise the rail a bit.
Do I need anything else to mount my scope?
You will need scope rings (usually comes with your scope) which can mount to standard Picatinny or Weaver style rails in order to attach your scope to the rail.