I bought the Fab set, ended up replacing the upper with an NEA to mount a sight as I didn't like the thought of a sight on a plastic rail. I kept the lower with a Tangodown vert grip, and even after 80 rds rapid fire I can still hold the foreend. But even though I like the insulation effect of the polymer lower, I would by the NEA handguards if I was to do it again. The Fab's look good but in the end you will end up wanting the NEA's. YMMV.