I am using this bipod with a Ruger 556 and it works great. There are many adjustments so it is very versatile. Some adjustments can be locked in a fixed position which is also useful. You probably won't find a more flexible bipod for you AR-15.
Pros: very versatile, many adjustments
Cons: none
This review was written in the old system and had content requirements that are different than reviews written today.