I am just going to give my personal opinions, observations and views about these firearms as the above article already covered the technical details comprehensively. There has been similar systems in place over the years, I recall seeing one on the Discovery Channel's "Future Weapons" episode, for example, but none has been able to integrate digital technology to firearms as seamlessly and as smoothly as this one.
'Longbow and Crossbow Similarity'
The invention of these PGFs remind me of the history of the Longbow and the Crossbow. Longbows were THE penultimate range weapons in its day, but it had one main drawback, and that is was is difficult to master. The strings were hard to pull back, and as if that was not enough, you have to hold the weapon in tension as you aim it, before releasing it to its target.
