Could be better, now it is a bad product - UTG Pro AR15 Free Float Quad Rail

I would not recommend this product. The barrel nut is very thin, and made from 6000 series aluminum, which is not strong enough to retain strength and accuracy. I prefer steel barrel nut, and if using aluminum, 7075 T6 is a must for barrel nut. Furthermore, there is quite large gap between the handguard top rail and the upper receiver's top rail. I tried on Aero upper and Anderson upper receivers with two different .223 barrels, the result are the same. The instructions are confusing, because it came with 3 pairs of screws (6 screws total), in three different lengths, and the manual failed to explain the purposes of each lengths( I finally figured out myself after some tries ) .Will be return this product. Please pass this information to the manufacturer , and if they can spend just a little bit more effort to improve the points I mentioned above, this could a killer deal and great product.