here is the new rest approved for the UK military...
I don't quite know the weight or cost and I would worry about the stability under baked bean conditions or after Taco Tuesday....

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LOL.... just had to throw that on in for a laugh or two....WHOLE NEW MEANING TO THE TERM "SHOOTING BUDDY"
I think a two piece is the way to go too. I don't like the lead sled type of rests. I always try to shoot as close as I can to what the conditions will be in the field. I personally like my harris bipod in front and a good rear bag. I find that way, I have the same results in the field as at the range... just my .02