We covered the TangoDown KeyMod Stubby Vertical Grip back when it was still an early prototype. I am happy to report that it is extremely close to entering production now along with KeyMod rail covers and a hand stop.
The new hand stop and rail covers have two things that should really set them apart. The first is that they use metal KeyMod hardware to mount. This is heavier than many of the all plastic rail covers but has proven to be stay in place better in my experience. The second is that these items will feature a similar texture to what Tango Down uses on their SCAR panels. This texture is very grippy without being too abrasive.
It looks like TangoDown is getting into KeyMod in a big way.