Screws used to install can scratch up barre. (read review for more info)
I have had this had guard for a little bit now. it works, looks, and feels great. i got it for like 65 bucks because if you join opszone they will give you a discount code for 10% off. the hand guard is a must have for anyone looking to turn their gun into a sweet looking M4.
to add to the weaknesses the screws might scratch up the outside of your barrel. but once you put this thing on you really don't need to ever take it off so it doesn't really matter anyway
I recommend this product because of its strength and if you have a stock it will balance your gun out nicely.