Vertical foregrip with ergonomics in mind. Slimmer profile, finger groves and finger stop. Does take up some rail real estate. Print with strength in mind, I usually opt for more walls than infill. Can be printed supportless if your printer is good at bridging. Other wise minimal support needed in the rail section, print upside down.
I went with M4x30mm socket head cap screws, but required screw length is 28.5mm. I also went with heat set insert over hex nuts, just prefer it that way. My inserts were 4mm long from this kit.
The author marked this model as their own original creation.