The bi-pod is pretty great, I got it for less than $20 last year at Cheaper Than Dirt but I guess the word has spread as now it's over $20. It mounts directly to a Pic rail and comes with an adaptor that lets you mount a small ( included ) Pic rail to a normal sling stud and yes you can then use that small Pic rail for lights or LASERs when the bi-pod isn't mounted. The Bi-pod itself folds, extends and even swivels side to side just a bit, very handy. I'm not really a bi-pod guy but it's great for zeroing a scope and as you can see lends a high "cool factor" to photos.
The foregrip/light is astounding because it solves a space problem on a forend rail, it can be hard to find room for both a light and a grip. Whatever 1" light you mount in it is then switched on and off with the grip trigger, very slick idea! The grip slides on and off the Pic rail with a cross block to lock it in place and there is a nice storage area inside the grip for batteries or whatever ( I'm gonna see if a Boresnake will stuff up in there ).