Originally Posted by Canadian Psycho
They have the PBB system, it does however greatly weaken the mechbox as it takes away a vast majority of the reinforcement of the mechbox.
Do you have any evidence to support this claim?
G&G's pneumatic blowback is implemented via a blowhole on top of the cylinder where virtually no stress or impact is experienced. In addition, the cylinder windows on G&G mechboxes are radiused, and G&G's mechboxes are actually made of rather nice metal.