There are quite a few videos of this on youtube. I tried it out but couldn’t even get close to clambering a round (snap cap in my case). I’m skeptical that these guys have factory springs in their guns… at the very least I’d say they would have a VERY “broken in” factory spring. I haven’t seen anyone do this in real life with a stock glock yet.
Maybe i’m just not quick enough. Once my shoulder and elbow recovers i’ll give it another try.