i am looking at the UTG bipods for my a r15. will mostly be bench shooting and some prone every now and then. i would like to use my 30rd mags also. which size should i get? center height of 6.1 to 7.9 inches or center height of 8.1 to 12.7 inches?
anybody use these specific bipods?

Caldwell AR Tactical DeadShot Front Rear Shooting Rest Bag Set Nylon

I recommend this. I don't use a bi-pod. I tried using my friends but its too unstable for me. I basically use the bag to sight in my rifles and my sling to shoot standing, prone. etc.

For bench shooting, I would go with the 6"-8" or a sand bag. Like AR-Getsome said, some people end up not liking a bipod. Or you could look at one of those rubber blocks like the NRA Store and Cabela's sells. Three different heights to choose from.

Just picked up a Caldwell bi-pod. It is 6 to 9 inch. I like it . It is all ways there and ready to go to the field. 30 round mag is a bit tight on ground clearance.

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Not so Free in the Free State

Most folks I see at the range seem to go with the Caldwell 6-9" - some with swivel and some without.

Go with the longer style.Where I shoot (private property) we have one low table and one higher one.We also use whatever chairs are available except the LazyBoy.We're not complete rednecks!

All I have are 30rd mags.If I was confined to using 10rd mags then I might think differently.

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so i just used some pieces of wood to match the center height of the bipods. everything will clear the 30rd mag. so that leaves me with which length one to get... if i got smaller one i would probably use it extended all the time, if i got the longer one i would use it collapsed most the time. i also thought about if i got the shorter one and it was too short for whatever reason i could throw a 1/2 riser on the mount to give me an extra 1/2 inch to play with..

Anything with 9" somewhere in the range is perfect.