[jhgb]

I assume that the time spent in barrel is more or less constant compared to the other variables (such as angular velocity or angular acceleration of the barrel around the time of firing) and can be considered a fixed time delay in the system?

[bombcar]

I think you could have a “free floating” barrel - these are already used to reduce barrel movement before the bullet leaves the barrel.

[laverya]

Free float barrels are designed more to make it so that a bipod or handgrip doesn't change the point of impact when you put wait on them, but I don't think that would matter here.

That being said, if I was designing a system like this, I'd be aiming for engagement ranges of ~100m to make target acquisition and aiming easier. You can ID something as "person" at 100m with a 4k video stream from a cell phone camera, but you'd need some really complicated optics to do the same at 1km. And at 100m, you can afford to lose quite a bit of accuracy to recoil.