I'm looking at Harris and Magpul.
One of my buddies is a retired airborne ranger and he likes his magpul bi-pods. I was surprised, but I guess they are pretty good. In the competitions I've been shooting lately, everyone is running the Atlas and one guy was using a fancy new generation Accu Tac FC5. It pans and swivels, which was nice for getting on the different targets quicker than your standard bipod. It also has a wide footprint, which makes it extremely stable. I like my Harris 6-9 swivel's, but that Accu Tac was pretty impressive. If I keep shooting those long range varmint silhouette matches, I may upgrade. Its going to be hard pulling out the $450+ for the Accu Tac though. For a Harris, I'd just look for a quality Aluminum sling stud mount specifically for the Harris. I prefer the low profile mounts. Ebay has some that are American made that work well. The last couple I bought were the magpul MAG609, I bought them there and they work well on my heavier AR10's. They are about $20, if I remember right. They are made in both Key Mod and M-Lok. The reason I use the Harris is because I can use my bipods on every rifle I own. They all have sling studs.. That's if you want to make things simple.
