Originally Posted by
Icculus
The only other person I saw mention the correct answer: ACS-L
I have an ACS, CTR, ACS-L and tried the STR. Yes the regular ACS is a big heavy pig which, imho, is best for balancing out a very front heavy rifle. Ditch the battery storage though and you end up with about the perfect stock; the ACS-L. Of course if you don't need your stock to collapse over a Vltor A5 extension then I might just say the heck with the fancy ones and stick with the classic CTR. YMMV
EDIT: Just reread and saw you already picked up the STR. Enjoy