The Striker hasnt been released yet. So I doubt many people outside of Kifaru have used it. But it uses the regular Duplex frame which has been around for a few years and that is one of the best in the industry at heavy loads.
The Shape Charge does not use the Duplex frame. It has it's own internal frame and is not designed to carry the same loads. As I recall its rated up to about 60lbs. Though the frame is quite a bit shorter then the Duplex. So it shouldnt be above your shoulders (which is part of the reason it doesnt carry as well, but should be better in tight spaces/trees, etc.)
The Shape Charge does not use the Duplex frame. It has it's own internal frame and is not designed to carry the same loads. As I recall its rated up to about 60lbs. Though the frame is quite a bit shorter then the Duplex. So it shouldnt be above your shoulders (which is part of the reason it doesnt carry as well, but should be better in tight spaces/trees, etc.)