I personally have a UTG. Yeah I said UTG and I love it. $30 and does everything it needs to do. Adjustable so you can use 30 round magazines. Plenty sturdy and folds up nice. I didn't see any reason to pay more than $30. I was contemplating a grip with detachable bipod but decided against it and just installed a magwell grip instead.
This is the one. For the money it is pretty hard to beat. Others will disagree and say it is of poor quality, but it is just as nice as my buddies GG&G in my opinion. His is a bit more heavy duty, but his was prob $150.
Harris #40854 here, $34 on Amazon
Product Features
Adjustable 6 to 9-inch bi-pod for precise shot placement
Spring-return telescoping legs fold out of the way when not in use
Compact and lightweight design
Attaches easily to a sling swivel stud
Steady shooting from both sitting and kneeling positions