Really? On que I can do it to most of my glocks.. Exception being the ones I used for competition (35/34) because they are purposely undersprung to shoot flatter.
Stock Glocks are way over sprung IMO.
Really.
As long as my arm is behind the gun, even with no grip at all, just the gun sitting on the web of my hand, and resting the trigger guard on my middle finger, with the only thing keeping the gun from leaving my hand being my trigger finger, the gun shoots every time.
Hold it sideways, like he does in the video, and move that arm offline, and from behind the gun, and you will start to have problems.
As I said earlier, I did that with four full 17 mags, and not one stoppage. Even when shot sideways, I didnt have near the trouble he was having.
Now, if I allow my arm to move rearward with the gun under recoil, it happens more regularly. But by doing that, youre taking, youre taking the energy needed for the gun to function away, or at least reducing it, and not allowing the gun to function properly. When you do that, its usually the same problem for any of them, not just the Glocks.
Not sure about them being oversprung, but all my Glocks have stock RSA's in them, and stock everything actually (all I add are night sights, and maybe stipple the grip on some), and Ive never had any issues with them, or problems shooting them.