angled foregrip
I wanted an angled grip for my airsoft rifle but I couldn't find one so I made a small and smooth angled grip for your rifle. I would recommend to have sand paper to smooth out the bumps to make it more comfortable to hold. Also to make the holes I use a small screw driver and push it into the print.
To make sure that your picatinny rail is the same size as mine, print this https://www.thingiverse.com/thing:6586472