Currently my gun has a Surefire 600-series DSF forend mounted on it. I'm mostly happy with it except for the weight and the occasional light ND when grabbing the gun.
I'm considering getting into a Magpul SGA setup -- haven't decided on the light or the means of mounting. For those of you who have tried both, which did you prefer and why? Am I downgrading by going to the SGA forend?