I have a Harris bi pod, I loved it, but it is heavy and spendy, its on a shelf now, I bought Tue stoney point bi pod love it, it goes from about 23"-48" roughly. Perfect for sitting or a quick knealing shot. I paid about $30 for it as a tri pod, the third leg was a pain on sitting stands so I yanked it off. Don't ask why but the tri was cheaper then the bi. It snaps on & off of ur sling stud with a detent on the stick end. You still have ur sling, snaps on & off in seconds,quick & easy. I put the sling adapter on all my guns, AR, up to my .375. Cabelas has them but if I member right they were pricey there. If you have a bi mart that's where I got mine. I also have a mono pod, just a V at the top. Keep it beside the drivers seat for the quick one that runs acrost the road with the pistol. Think I paid $10 for it at wallys mart. I hate that store but keep goin back.
