Ray nailed it It also doesnt hang up on gear as much. (Not as big of an issue this side of the pond but I still prefere it.)

I always ran my forward grip at a 45 anyways so when these came out I switched and never looked back.

http://store.magpul.com/category/88

GD the adams arms/huldra set ups have special BCG that prevents it from happening. (One of the reasons I chose them.)

JYD#176
"dein Gott schickte mich zu zerstören"
"Sic semper evello mortem Tyrannis"
"Sometimes the chance of a zombie outbreak is the only reason I need to make many of my life's Decisions." General Delivery