My question is. Say you got your hands on a G&G clear receiver. An example of a maybe M4 clear receiver. Will that clear receiver fit into g&g m4 models that are not clearsoft? So to clarify what I mean. You buy a clear receiver from someone. Then go to the states to buy a normal g&g or maybe even a jg m4 will that clear receiver fit? Are all m4 receivers the same? or do the model of the m4/m16 all have different receivers depending on the model?