yeah i noticed that, and i understand how it works, i just am more concerned with wether or not it works well enough to be worth the money. the stock pump set up on the phantom isn't bad- its just a little unnatural feeling.
right now, i am using a vertical foregrip off an a5 on my stock phantom pump handle. it took a little drilling, tapping, and a lot of sanding and filing on that EFFING plastic composite shit, but it turned out okay.
i just kinda think the underpump looks a little better, and IF it works well then i want to buy it. but i have yet to see anybody using it, so i wonder if there's a reason why i'm not seeing. either it sucks, or its just not being marketed well.
