I got the degenerate version of the Longshot recently and have been meaning to turn it into a FAMAS ever since.
There's some perfectly fine, well designed handles out there already but I wanted the practice and it ended up only taking an evening to knock out a shockingly decent attachment, so I figured I'd share.
Print the front and rear halves, they're already oriented for an extremely easy print. Print the rail and 2 pins, slide the front on, slide one half on, pop the rail in so the holes line up and shove in a pin, whack on the other half and knock in a pin.
The handle is intended to be held on with M5 gear or the printable attachment pins.
If you print it I'd love to see your makes and what else this dumb thing fits on, it's a teensy bit long for anything else I own.
Print settings probably don't matter all that much, I threw defaults at it in testing, I could see a few extra walls being a good idea if you're going to actually carry it with the handle. The rear half benefits from supporting the end of picatinny dovetail but my printer managed it in testing.
The author marked this model as their own original creation.