As you may have noticed I locked the last thread as some people appreared to have forgotten to take their meds while posting.
There is no anti rotation tab. What you are seeing is a notch in the hand guard...just like the last ones...so the hand guard can over lap the upper a bit.
Here are a couple of damaged ones side by side, last batch and this batch. There is also a picture of a Samson rail on this batch.


There is no anti rotation tab. What you are seeing is a notch in the hand guard...just like the last ones...so the hand guard can over lap the upper a bit.
Here are a couple of damaged ones side by side, last batch and this batch. There is also a picture of a Samson rail on this batch.

