This can be done not only with Glocks, but with most semi auto pistols. The reason the Glock is chosen for commercial manufacter is because it is the single largest market with the exact same dimensions and required design of the modified parts.
1911s on the other hand vary significantly depending on what manufacter they come from, and tend to be more unique and custom. Glocks are all the same in the necessary area.
So to make such a product for another firearm would require as much investment, but have far fewer customers in an already tiny market. In fact it would be nearly impossible commercialy as the dimensions of other firearms vary too greatly.
So from a business standpoint it really only makes sense for Glocks, as the same design can work for multiple caliber Glock pistols, lending itself to the modular design and simularity of all Glock pistols.
However as an individual not concerned with mass producing them, assuming you have a SOT and go through the necessary legal steps, you could just as easily use the same concept to turn most semi auto pistols into full auto on an individual basis.
However since the technology is proprietary you may have to do the legal dance.
However the people that can legaly purchase or play with such toys are so few, that a business catering to them and making a profit (a legal requirement) would be difficult.
Most people on youtube are either at a legal event, public machinegun shoot, or are doing so illegaly. The number of people that privately own such things legaly and would be alone shooting them are very few. That those few would then be posting thier videos of them shooting in the woods is even less likely.
Doing the simple modification without a license is obviously highly illegal, and would be manufacturing a machinegun.
Automatic fire is also very distinctive and will cause heads to turn or authorities to be dispatched in many locations (even ones familiar with gun fire, just ask people bump firing). Such a device would require a lot of training to be come profecient with accurate controlled bursts of fire, and if possession is illegal, training is going to be hard to accomplish.
So all around it is a bad idea to contemplate doing so.
That said full auto can be very accurate from a pistol. The general practice is small bursts of fire, aim slightly lower than the desired point of impact, and placing consecutive shots one above the other through the target in full auto.
The better you get the smaller the burst of shots becomes.
Trigger control becomes very important, while in semi auto fire trigger control barely matters, in fact many practice with "follow through" depressing the trigger longer than necessary in semi auto fire. So they would have to completely unlearn such a technique.
Picture bursts of about 3-5 rounds and recentering. One could accurately fire off a 33 round magazine of 9mm in about 7 quick bursts of fire. It would take about as long as 7 individualy well aimed shots at 1200-1350 rounds per minute (20-22 rounds per second.) About 3-4 bursts with a 15 round mag.
The groups at 7 yards would be only a few inches across.
If people have a use for MAC pistols, then I don't see why a more ergonomicly designed pistol with a similar rate of fire is not just as useful.
