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That's a JG HK416, right?
First, check if the two pins of the front sight are there (on its bottom).
If not, the outer barrel may be misplaced.
-Remove the handguard;
-Take out the outer barrel then put it back in (be careful, there's a small spring there) to ensure it's properly seated;
-Screw back the barrel nut, tighten it;
Check if it's better.
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