Excellent rubber texture - UTG Pro Low Profile M-LOK Panel Covers, 4/Pack

These are absolutely perfect for any of the slimmer and lighter rails if you are looking for a rubberized texture and slightly thicker panels to provide a more secure grip. I find the thicker profile to help with overall comfort when carrying the rifle and when shooting. Using some lower-profile panels along with whatever your preference is for a hand-stop makes for an absolutely perfect combo. You get a secure grip regardless of how you are shooting.
For the low profile, I recommend the Walker Defense Nile Silicon Carbide panels. They are super low profile and provide an aggressive texture that works perfectly for control at the front of the rail and on the bottom (if bottom texture doesn't impede your grip adjustment). If you generally use gloves when shooting, I wouldn't bother with adding texture on the bottom. If you are using your rifle for home defense, I would highly recommend it as these panels will provide grip through the sweatiest of palms - something you might deal with in a home invasion scenario.
On top of that, these panels will look like they came installed from the factory with how well they compliment the slimmer rails.

TLDR: Buy this if you want the absolute best rubberized rail panel out there for M-LOK. Can't recommend them enough!