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The G&P bodies are really tight when new. Unless you're trying to use a real steal -threaded front end (or barrel nut/delta ring), don't use Madbull thread cutter on it.
Most likely it's just really snug; I've encountered this as well with two different G&P bodies. Find someone with an armorer's wrench and use that to tighten the barrel nut. With the wrench it should be relatively effortless to screw on; if you have to force it, then stop cuz something's up.
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