All the alloy framed CZs have the wider step above the grip. PCR, P06, P01, Rami, Compact L, Shadow Line Compact. This adds thickness in the frame rail area so where the slot is cut it wont get too thin.
Most of the frames are beginning to get the D style mag release and move away from the O style.
Most of the frames are beginning to get the D style mag release and move away from the O style.