I have 2 screws in My lower barrel band into My front handgurad stop the wobble i let a friend have it to see if He could fix it and he puts SCREWS IN MY lower barrel band into my front handgurad

is it against the rules

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Glued and screwed is fine for NRA Highpower and CMP Unlimited. It is illegal for CMP JCG and NRA As-issued.
My understanding is that the front hanguard should be loose. Basically, you don't want any wood touching the barrel anywhere. Screws are a no-no for "as-issued" matches.