I've always used rearward pressure on the foreend of a carbine when shooting "fast." I'm pretty sure I started doing this while using a vertical fore grip, but I still do it without any kind of fore grip or hand stop. This technique has always seemed somewhat counterproductive to me, since it adds force in the direction of recoil, like a traditional Weaver pistol grip, but the gun stays noticeably "flatter" when using rearward pressure compared to just holding the fore end up.
In this video, Jack talks about using forward pressure on the fore end to get better recoil control while shooting an SR25:
It's pretty easy to see that Jack is getting very good results with this technique. A 3x5 Half & Half is super impressive with a battle rifle.
Theoretically, this technique makes way more sense, the force is opposing the direction of recoil, and it is what I do when shooting a pump action shotgun already.
So, what do you do, push or pull, and why?