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Two-part epoxy injection comes to mind, after reading all this...
Listen, geeze, here's ONE free clue; airsoft guns make some noise. It's NORMAL. Just deal with it.
And another free clue (I'm generous for some reason); expanding foam would totally screw your gun up forever. So would epoxy. It's like us telling you to fill your gun with cement and you're buying it for a fact.
You know painfully little about airsoft, so how about you study a bit more before asking questions? You might learn useful stuff.
End of clues, start reading. At 17 you should know how to read and use the Internet.
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