I have a 16'' mid barrel from DD that was installed using the Larue 13.2'' handguards and barrel nut. I tightened the nut to 40lb/ft when installing it.

Anyways, my question is, is it normal to have a little up and down and lateral flex to the barrel? i'm not talking about play, just flex. if i pinch the barrel and the handguard together i can induce some flex, is this normal? the gun shoots 2-3in 5 shots groups with a red dot @100yards, so accuracy is acceptable.