The attachment will make it like the HB, fad, or arx(minus the hipfire). It honestly wont be worth it though.
When you need that fast fire rate you would just switch it to smg mode.
From what I have seen, the AR sight is like a red dot/tracker hybrid(just looks only, not the tracking ability). It seems a bit lackluster to me as well
Completely blowing the hype of the gun out of proportion.... It really is not that good (not to say it cannot hold its own). Play 5 games with the mtar and vector, and tell me this (mediocre, by design) DLC weapon is the hands down best gun in the game lol. Are you and your friends dropping KEM's in smg mode on stonehaven, or are you/they just doing well with it on the new maps designed for smgs (compared to people still using the maverick and other AR's)?
There is around 30% of the community that will have access to map packs and DLC weapons. Why on earth would they design a gun that is as OP as some of you claim?! They literally could make a new gun with the same exact stats as the bizon, and people would cry "OP!" after someone outgunned them a couple times. People post KEMs all the time with bad weapons. It is time to start realizing... maybe it isn't the other person's weapon of choice holding you back from success.
Because putting rapid fire on it for the boost to AR is a waste. Why waste an attachment slot on rapid fire when you can just press a button and make it shoot 900 rpm when needed? The gun is best used running it as an smg and switching to AR mode when you need to pick someone off at long range.
The FAD shoots at 882ish rpm, but you don't see people dropping their AK, remy, or HB classes to use it. There are better AR's for the range, and there are better smg's for up close. This is nothing more than a middle of the road gun, while pretty strong in smg mode, to add diversity to the dedicated communitie's choice of weapons