As a designer, I am not a fan of parts that require permanent or semipermanent modes to the gun.
Not to hijack and pimp my own stuff, but If you can wait a few more weeks the Manticore Extended AK forend will be out, and it drops onto the AK with no mods needed. I designed it from the outset from "drop on, drop off with no mods" installation in mind. I freaking hate having to chop on a gun to make something fit.
The price of the Extended AK Forend will be higher than the Extended Zhukov (machining costs are pretty high to knock all four components out of solid aluminum billet), but the weight will be the same as the Zhukov and you can Keymod that bitch up all you like once the Extended AK forend is mounted up, plus picainnty on top for optics and any other goodies you desire.
Sven
Manticore Arms