Yeah, I actually bought that one because you had mentioned that it would fit in the stock tube.  It doesn't, but it does fit in the buffer tube so it's no big deal.  VFC updated the 416 at some point and my guess is that they went to a more correctly sized stock, which means it wasn't large enough to fit the lipo in the stock tubes.  As a comparison, my PTW has an oversized crane stock that will fit sub-c cells, but my old G&G M4's stock was smaller and only fit 2/3A.  I'm thinking VFC started with stocks that would fit the larger cells and then switched up for the version 2 416.

[edit] I just double checked.  That lipo does fit in my PTW's stock tubes and does not fit in my VFC 416's stock tubes.  If you wanted to run it in the stock tube, look for a crane stock that will hold sub-c sized cells.

I have a VFC 416 and I run this pack in the stock:

http://www.eliteairsoftbatteries.com/products/242-newelite-airsoft-red-1100-3s-111v-30c-lipo-stick-battery-pack.aspx

If you don't already have a LiPo charger, I and a lot of other players love the Thunder AC6 charger:

http://www.hobbypartz.com/thac6smbachw.html?gclid=CJqv5tv2_sQCFQuNaQodjVEA8Q

It'll do every battery you could ever want to use in airsoft.  It's a little tricky to learn, but the manual is pretty helpful.  Once you get the hang of the menu system, it stops being so daunting.  If you need a charger, this is the one to get.

My Crye AVS and Eagle Plate Carrier:

SystemA PTW





VFC HK416





TM MEU



WA SVI 4.3



WA Wilson Combat with MEU



KSC M9s



KJW P226



Crye AVS



Eagle Plate Carrier