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Yeah, right off the bat you should be aware that there are some legalities involved in manufacturing anything that resembles a firearm. If you have all the required equipment and were to build it yourself, then you could probably get away with it, but if you have to get it made by someone else, you could have issues finding someone to make it.
Your best bet is to find an existing airsoft gun that most closely resembles what you're designing and modify it accordingly. One example of this would be how one can make an Aliens space marine pulse rifle out of a TM Thompson submachinegun.
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