It would be fair to say that the current day rifles, handguns and anything that goes bang and sends a projectile down range all started from the caveman throwing a rock, spear, bow and arrow as examples.

The progress in this field has been both simplistic in one aspect and very advanced in another.

What in your opinion will be the next big advancement in firearm technology?

The weapons itself?
The additions like the scope?
The bullet?

But more importanlty how will it be the next big thing.