Yeah it is, I had a look at it once I got back home and the whole assembly in on backwards. I,m not sure if I should remove it and put it on again facing the right way, I think it's a bit out of my skill range.
I drifted the sights so my point of impact is pretty close to point of aim at 100m good enough for plinking I'm not sure how much it will effect my point of impact at longer ranges seeing as my sight radius is shorter because of this screw up.