Great price & option - UTG Pro AR15 Free Float Quad Rail

Picked up the 9 inch rail for a 10.5 Andro Corp upper. The barrel nut is quite thick regardless of if steel or aluminun, was impressed by the inclusion of anti-rotation tabs screws. The screws themselves aren’t great so likely best if you plan to install without switching to something else down the line. Only real complaint is that this left a small gap between the rail and receiver, a big drawback for some but small enough to not bother me. No issues at all after about 300rds, retained lock up