CHANGE NOTE 03/31/18: Added Upright print orientation. If your printer has enough room, this will produce a much nicer quality of print.
CHANGE NOTE 11/23/17: Cut front of CORE part down a bit to make it a looser fit and easier to install.
Angled foregrip styled and designed to match the Nerf Caliburn Homemade. The "Core" part can either be tapped for UNF 10-32, or you drill the hole out to .205".
Slide the foregrip over the rail segment, then slide the "Core" part in through the opening in the side to lock it into the rails. Secure the "Core" to the foregrip using a screw and optionally a locking hex nut.
The foregrip also alternatively includes a through hole at the rear if you just want to use the typical through-bolt mounting method.
Inside of the foregrip will usually require filing or touch up with a rasp.