This handguard is great. It is light weight and really helps save a little weight when running a heavy barrel on a setup. I have a few on a different upper assembly. While I do love the handguard it is limited to just the sides and top and bottom for accessories like WML. You cannot offset a weapon light or others to this item. That is not a deal breaker for me at all, but some people may not like this. The anti-rotation system works perfect on regular profile lowers. Never had a QD link fall out etc etc. I have seen some reviews giving this product a 1 star for "lack of quality control" while using a lower that does not follow the normal M4 upper profiles and being much larger and wider than what the cut outs are designed with. Ohhunt, you should really make a note of this in your description to make sure people using custom uppers don't give you an unfair review because they didn't look at the profile and the style of the cut outs. Personally, I give this product 5 stars. Out of the 3 that I have bought of this design they fit over my aero uppers perfectly and I have zero issues with them. I have a dirtbird hand guard that costs 3x more and I like this one almost as much as that one. Any hunting upper I build usually gets one of Ohhunts hand guards, depending on the application. 0 issues from me, 0 complaints. This is more than adequate and at a very good price. I am not a rich man; I do not want to spend 300+ on something that's going to be banged up or scratched to **** out there while hunting. This and an occasional rattle can job on the rifle and using it for what it is, a tool. I will be buying more in the future.