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If youtube takes those down (apparently they have been pulling videos about bump stocks recently and I wouldn't be surprised if they took down videos about bump firing without special stocks) you could also try these video (but the first three guys do it better) youtube.com or this one youtube.com
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... Bump firing uses a weapon's recoil to rapidly actuate the trigger. After each shot, recoil moves the weapon rearward enough for the trigger to reset and then the forward pressure of the left hand moves the gun forward again, against the stationary trigger finger, firing off another shot in rapid succession. Put simply, bump firing is letting the weapon move back and forth under recoil about an inch while the trigger finger stays in one place. The traditional method involves a finger stuck in a belt loop, but can also easily be done from the shoulder with no modifications.
Enter the bump stock. A bump stock is simply a chassis the weapon sits in, allowing it to slide back and forth about an inch. So, to bump fire, instead of a belt loop, the trigger finger sits on a plastic shelf while the rest of the gun is pushed forward with the nonfiring hand, tripping the trigger and firing the weapon. As above, recoil drives the gun rearward, resetting the trigger, allowing it to fire again.
It is important to note that to get a gun to bump fire, with or without a special stock, the trigger finger has to stay completely still. This means the shooter has to stay as still as possible while pressing the weapon forward. This is why successful bump firing requires a sterile environment, where the shooter can stand completely still to take advantage of the recoil. A fully automatic weapon, on the other hand, fires as long as the trigger is pulled no matter what.
Under U.S. law, a fully automatic machine gun is a weapon which fires more than once with a single actuation of the trigger. This is why bump firing a semi-automatic weapon does not make it a machine gun.
So, clearly, rapid bump fire is not a function of the stock, but a natural byproduct of recoil. It is for that reason, and several others, that a ban on bump stocks would not make any difference, much less enough of a difference to justify a ban. The only way to prevent bump firing would be to ban recoil, which would be more than a little bit difficult — you can't repeal the laws of physics...
The bump firing process involves bracing the rifle with the non-trigger hand, releasing the grip on the firing hand (leaving the trigger finger in its normal position in front of the trigger), pushing the rifle forward in order to apply pressure on the trigger from the finger, and keeping the trigger finger stationary. During a shot, the firearm will recoil ("bump" back) and the trigger will reset as it normally does; then, the non-trigger hand pulls the firearm away from the body and back to the original position, pressing the trigger against the stationary finger again, thereby firing another round when the trigger is pushed back.
Normally, a rifle is held securely and firmly against the shoulder, but the loose shoulder hold that creates the rattle to rapidly depress the trigger affects accuracy in a way that is not encountered with firearms that are designed for select-fire.
A similar method can be employed with semi-automatic pistols, in which one hand holds the grip, two fingers are placed in the trigger well, and then the grip hand shoves the weapon forward while the trigger fingers remain stationary. With revolvers, rapid fire can be achieved by using two trigger fingers firing offset.
Home made slide fire stock for less than $20 Part 1 youtube.com
OR just plain old regular speed shooting by rapidly pulling the trigger which for a skilled individual can be almost as fast and more accurate youtube.com
