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I have seen/worked on plenty of V2 systema and other reinforced gearboxes that have cracked. As stated before they are all cast not machined so this will lead to problems in the cold and impact. I have seen them break in the same manner as the TM boxes. Usually breaking on the forward end under the cylinder. Usually caused by impact with m120 springs and higher , the piston head looses some of its seal and slams the front of the cylinder causing a crack. The MOST common breakage on the systema boxes is actually the trigger post for some reason its the worst out of all the gearboxes. The post is half the size of the TM one and breaks constantly. It can be reinforced by drilling out the post and adding a solid piece of metal. I have also seen a few systema boxes fail due to the cold. Usually around -5 they can break in the same manner as a impact failure.
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