it is a solid metal frame. with glocks you need to use a wooden plank at the base of the grip - here you just turn gun vertical, barrel looking up and not into your face
, grab slide very firmly in your hand, and then smack the handgrip at the wooden bench where you are firing.
if you use any turkish ammo it will become a routine as they have shitload of non-concentric rounds that stuck like that. venom stucks like that all the time.
smacking it with your hand like video shows - good luck with that. if you are home - well, a rubber mallet is more gentle than a wooden bench at the range, but, i would not be doing it at home in the basement.