Ok, so I know the whole concept behind FF and non FF rails... And I wouldn't mind swapping my MCTAR-17 for the FF rail version. BUT! How prone is an MI FF rail to rotating? I saw the 2 notches in the collar portion which 'lock' into the barrel nut -- but if the design is that simple, why dosn't everyone else do that? And if I keep my non FF rail, how detrimental will it be to mount a light and VFG to my normal accuracy? I'm not building a tac driver, but I'm not gonna make something worse when a few extra bucks would resolve it.