Looks and feels great; not for all handguards... - Griffin Armament Rail Shield 4 Piece M-LOK Furniture Set

These are my favorite polymer rail covers so far. Nicer panels exist, but nothing that I've seen in this price range beats the GA set.

This comes with four panels altogether, but only enough hardware to install three of them at a time. Two of these have opposing curves and are meant to be installed on either side of the handguard. The other two panels are flat and are meant for the bottom -- one of the flat panels has a handstop and the other does not, so you can take your pick.

The grid texture on these panels is somewhat grippy without being aggressive. This texture will not grab yuor hand, so don't expect anything super sticky. It is, however, entirely functional and provides an amazing look to both long and short rifles. Each panel is 3 m-lok slots wide.

Since the side panels are not entirely flat, they won't conform to every handguard perfectly. I tried them on a Radical Firearms handguard first and they fit like a glove. I tried them on a Forward Controls Designs handguard second, and the slimmer/rounder profile of that handguard made it so that the rail panels "hung off" from the edges a bit, which I wasn't a big fan of.

I'll also say that one of the included t-nuts mysteriously snapped in half while I was giving it only 15 in-lbs of torque.

Those caveats don't stop me from giving this set two thumbs up though. I really like it!