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There are the differences that illusion stated. Also some of teh internals have slight difference , slots for piston being different sizes , the trigger post being different sizes (systema's are small then marui and break alot). There are also difference in the overal length and width of certain gearboxes , systema being slightly wider then marui , and i believe classic army being slightly longer. Most ver2 boxes are close enough in tolerance that thier isnt a problem but sometimes you will run into a piston not fitting or a gearbox not fitting in a tight metal body.
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