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Originally Posted by CalvinTat
K, so with the metal body, it only comes with that right? you still have to use your plastic upper receiver? How much do upper receivers usually run:
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Comes with what?? M4 metal bodies are sold by the set. Both the upper and lower receiver, hop up unit and some other parts come with the set. I've only used Systema bodies for my normal Armalites. They can be a pain to install the mechbox because of the tight fit but I've not had any problems with them. They run about $300-350 a set.