How does this work?

It's not magic.
Lots of pumps will open the action if the action lock, at the back of the trigger guard, is pressed up when the trigger is pulled, from the force of the recoil.
The guy shooting in this video is then shoving the action forward, overhand, right after he drops a new round through the ejection port.
Mighty quick, ain't he?
 
Most any pump will do that. Maybe not when new and the parts have not been broken in. Nothing special in that video.
 
If that is what the guy is doing, shooting with the action lock released, can that damage the gun. I would think that many parts of the action and trigger assembly may not be designed for the force that blowback may generate.

I am reminded of the 1960 Westerns and the guy that fans his six shooter. It looks impressive, but was it that accurate to anyone but a particularly skilled trick shooter?
 
I wonder what would happen if you then put a strong rubber band holding the pump forward so that it would close itself too.
 
He's NOT "pressing the action lock then pulling the trigger".

The gun appears to be a Remington 870 and like all modern shotguns the action lock disengages the trigger mechanism when it's pressed.
You CANNOT "press the lock and pull the trigger to fire".

What is happening is the shooter is firing heavy buckshot loads.
Many shotguns will open the action themselves if the hand guard isn't held forward. The Winchester Model 1300 actually had a spring "assist" action to help this along.
Many good shotgunners can fire a pump gun will almost semi-auto speed by taking advantage of the actions tendency to partially or fully open itself, especially with heavy recoiling shells.

Doing a search on the gun forums will turn up a good number of posts asking what's wrong with their shotgun, because the action is opening on it's own.
 
Cheapshooter said:
Not how, but why? Looks like a completely useless drill. Is it supposed to impress somebody?
Click to expand...

I don't think he's trying to impress anyone. Just soldiers having a little fun, and blowing off steam.
 
Dagnabbit, Dfariswheel,
You make me go dig out my old Mossberg to see if the trigger works, when the action lock is pushed.
And it does.
Must be different than the 870.
Where it's located, it's kind of hard not to push the action lock upward, with finger number two, when gripping the stock.
And the trigger does, indeed, still drops the hammer.
I tried it many times, with the hand on the stock grip as normal, and by doing it kind of remotely, hand off the stock.
Dang, I should have made a bet first.
Never think of these things fast enough.
 
Our shotgun class covered getting your now empty 870 firing again, and the first move was to toss a live round in the ejection port, just like you see there.
 
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