I’ve been told that the glock is designed to flex under recoil. This is supposedly glock’s way of reducing felt recoil.
First time I've heard that. I was always told that the Glock has less "felt recoil" because the axis of the bore is so close to the hand. So a Glock 45 will feel like it's kicking less than a Colt Government model because the barrel on the colts sits a bit higher above the frame. This low bore axis ratio is also what makes the Glock a natural "point" shooter....