My understanding of the flintlock rifle is that if you don't get lucky drops, and get other sniper weapons, it's good, it will quickly be overwhelmed by the other options, but for the resources put into it, there's a good payoff.
So idea, somewhat linked to the active camouflage that Meridian designed: How difficult would it be to do silenced weapons, ones that don't mark you in enemy Intelligence when you shoot them, other than direction the bullet came from, and don't even give that if the target is alone and killed by said bullet?
Naturally, they would have to be balanced through weaker bullet damage and range, probably don't need other stuff though.