If you don't have any prior AEG experience, don't attempt to build your own. As already stated, you won't be able to get your hands on an upper reciever in country(highly unlikely). I would reccomend you wait for the Echo 1 version to be in country, they look promising. Upon getting more familiar with the guns, eventually you'll be able to build your own custom project.
If, however, you decide to go ahead with this build, you'll need to either get a complete mechbox, or the shell and all its inards seperately. Of which requires mechbox experience or a gun doc.
You also left out flashhider, inner barrel, hopup unit, hopup rubber.
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