For prone with a collapsable stock on a carbine, I'd go with the UBR. It's designed to work with a carbine buffer (although you have to install their included extension tube), and your cheek weld will be on the cheek piece even when you're in a "turkey neck" position, rather than on the tube. Then, you still have the collapsing feature for other types of shooting.
By three methods we may learn wisdom: First, by reflection, which is noblest; Second, by imitation, which is easiest; and third by experience, which is the bitterest. - Confucius
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