Zinkuno, you should probably decide if you want a single stage or 2-stage FCG.
If you are only used to a single stage FCG (the standard AR FCG is a single stage), you may or may not like 2-stage FCG. Anecdotally, most of the folks I have introduced to 2-stage FCGs that had never used one had to take some time to get used to them, or just didn't like them as they (their words) could not get used to the take up (1rst stage).
I tend to use 2-stage FCGs in my magnified optics (longer range) builds and single stage FCGs in my irons/RDS/LPVO builds. A few friends use (and enjoy) 2-stage FCGs in all of their builds for consistency. I am sure others here have other experiences they can share.