Good product! - Magpul MAG1365-FDE Rail Covers Type 2 Half Slot For M-LOK, FDE Aggressive Textur

Guns get hot when used. You can use gloves and/or a for-end vertical grip. For-end-grips are not allowed on "pistols" E.g. barrels less than 16" and not registered as an SBR. So, if you have a "Pistol" with a pistol-brace, you need to cover the hot end. These protect your hands and if you mix the colors, they give a sort-of camo appearance without painting your gun.
They install easily enough. I wish they were a little more secure. I don't know how much rough use they can handle w/o falling off. But I like this product so far.