All4shooters website has recently added a well-assembled summary on GDs LWMMG.
See http://www.all4shooters.com/en/news/...rosatory-2014/

An accompanying video shows muzzle jump off the lightweight tripod and also vehicle mounts, but seemingly less off the bipod. The apparent lack of success on the sales front might be partly explained by a lack of linear attachment buffers or by a need for some heavier form of softmounting.