ApacheTactical
Plinker
I used to use the straign sticks but i tried one of the magpul AFG and fell in love. I would at least give this a try before you purchase one.
AFG® - Angled Fore Grips - AFG® - Angled Fore Grip
AFG® - Angled Fore Grips - AFG® - Angled Fore Grip