Not really worried me as such, just wondered what it was.
Been very happy with it, I don't use it any more as I prefer my m4 instead. I bought the scar as it was a good deal at the time but not it just sits in the garage- nothing to take away from the gun though, very happy with it in pretty much every way- a tad on the heavy side but that's not a bad point really as that's a trait of the rifle if anything.
If I was being really picky I'd say the plastic isn't as good as the vfc and as mentioned the stock isn't great, but one set to a position there's no need to change it so not a really issue in my opinion.